Functionalized fluoroalkyl fluorophosphate salts

ABSTRACT

The present invention relates to functionalised fluoroalkylfluorophosphate salts, in particular as ionic liquids, to the preparation thereof and to the use thereof.

The present invention relates to functionalised fluoroalkylfluorophosphate salts, in particular as onic liquids, to the preparation thereof and to the use thereof.

Ionic liquids or liquid salts are ionic species which consist of an organic cation and a generally inorganic anion. They do not contain any neutral molecules and usually have melting points below 373 K.

The properties of ionic liquids, for example melting point, thermal and electrochemical stability, viscosity, are strongly influenced by the nature of the anion. On the other hand, the polarity and hydrophilicity or lipophilicity can be varied through a suitable choice of the cation/anion pair. There is therefore a basic demand for novel ionic liquids having varied properties which facilitate additional potential uses.

EP 0 929 558, WO 02/085919 and EP 1 162 204 disclose salts containing perfluoroalkylfluorophosphate anions (FAP anions for short). These salts are distinguished by high electrochemical and thermal stability and at the same time have low viscosity. Salts based on FAP anions are substantially inert and have greater stability to hydrolysis than, for example, salts containing PF₆ ⁻ anions.

However, it is often desired to have available compounds, for example as reaction medium, which can be decomposed easily after the reaction has been carried out in order to reduce the environmental pollution with compounds of very low biodegradability.

There is thus a demand for novel compounds which have easier degradability. In the case of organic cations combined with the functionalised fluoroalkylfluorophosphate anions according to the invention, these are particularly preferably ionic liquids.

The object of the present invention is accordingly to provide novel compounds which are suitable, for example, as acid catalyst for chemical reactions, as additive in electrolytes or, in the case of organic cations, as ionic liquids.

The present object is achieved by the compounds according to the invention, processes for the preparation thereof and the use thereof.

The present invention thus relates firstly to compounds of the formula I

Kt^(Z+) z[P(R_(f))_(n)F_(5-n)X]⁻  I,

where R_(f) in each case, independently of one another, denotes a straight-chain or branched fluoroalkyl group having 1 to 8 C atoms, X denotes OR, Ac, OAr or OHet, Ac denotes a carboxyl group OC(O)R, also including carboxyl groups of an aliphatic dicarboxylic acid resulting in compounds having the formula Ib

x[Kt]^(Z+) y[(R_(f))_(n)PF_(5-n)(OC(O)—R′—C(O)O)F_(5-n)P(R_(f))_(n)]²⁻  Ib,

where x denotes 2 and y denotes 1 if z denotes 1, x denotes 1 and y denotes 1 if z denotes 2, x denotes 2 and y denotes 3 if z denotes 3 and x denotes 1 and y denotes 2 if z denotes 4 and R′ denotes a single bond or an alkylene group having 1 to 4 C atoms, Ar denotes an aryl group having 6 to 12 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, Alk denotes a straight-chain or branched alkyl group having 1 to 12 C atoms, Het denotes a heteroaryl group having 5 to 13 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, R denotes H or a straight-chain or branched alkyl group having 1 to 20 C atoms, which may be partially substituted by Hal, NH₂, NHAlk, NAlk₂, OH, NO₂, CN or SO₃H, or denotes a straight-chain or branched alkenyl group having 2 to 20 C atoms, which may contain a plurality of double bonds, where one or two non-adjacent carbon atoms of the alkyl or alkenyl group which are not bonded to the heteroatom may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, NH, —C(O)—, —O—C(O)— or —C(O)—O— and Kt denotes a stabilised (solvated) proton, a metal cation or an organic cation, Hal denotes F, Cl, Br or I, z denotes 1, 2, 3 or 4 and n denotes 1, 2 or 3, and/or tautomers or stereoisomers thereof, including mixtures thereof in all ratios.

The number z stands for the degree of charging of the cation and thus for the number of anions present in the compounds according to the invention. In total, electroneutrality of the compounds should be ensured. The number z denotes 1, 2, 3 or 4.

The compounds of the formula I according to the invention make it possible to provide ionic liquids having properties which can be adapted to the respective use. The compounds of the formula I are less hydrolytically stable than the perfluoroalkylfluoroposphate anions which are already known and are therefore more easily accessible to biological degradability.

Furthermore, the compounds of the formula I, which tend to be hydrophobic per se, can be converted into the compounds having the same cation, but perfluoroalkylphosphinate anions, which tend to be hydrophilic, by reaction with water or a base. Owing to these unusual properties of the compounds according to the invention, different compounds having certain properties can be prepared as needed, for example for use in extraction methods. In-situ conversion of hydrophobic ionic liquids into hydrophilic ionic liquids enables the development of a simple isolation method of water-insoluble products after a synthesis in hydrophobic ionic liquids of the formula I.

A straight-chain or branched fluoroalkyl group having 1 to 8 C atoms is a partially fluorinated or perfluorinated straight-chain or branched alkyl group having 1 to 8 C atoms, i.e. in the case of a perfluorinated alkyl group all H atoms of this alkyl group have been replaced by F. In the case of a partially fluorinated alkyl group having 1 to 8 C atoms, the alkyl group has at least one F atom, 1, 2, 3 or 4 H atoms are present and the other H atoms of this alkyl group have been replaced by F. Known straight-chain or branched alkyl groups are methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, n-heptyl or n-octyl. Preferred examples of the partially fluorinated straight-chain or branched alkyl group R_(f) are CF₃—CHF—CF₂—, CF₂H—CF₂—, CF₃—CF₂—CH₂—, CF₃—CF₂—CH₂—CH₂— or CF₃—CF₂—CF₂—CF₂—CF₂—CF₂—CH₂—CH₂—.

A straight-chain or branched perfluoroalkyl group having 1 to 8 C atoms is, for example, trifluoromethyl, pentafluoroethyl, heptafluoropropyl, heptafluoroisopropyl, n-nonafluorobutyl, sec-nonafluorobutyl, tert-nonafluorobutyl, dodecafluoropentyl, 1-, 2- or 3-trifluoromethyloctafluorobutyl, 1,1-, 1,2- or 2,2-bis(trifluoromethyl)pentafluoropropyl, 1-pentafluoroethylhexafluoropropyl, n-tridecafluorohexyl, n-pentadecafluoroheptyl or n-heptadecafluorooctyl. Preferred examples of the perfluorinated alkyl group R_(f) are pentafluoroethyl, heptafluoropropyl, heptafluoroisopropyl, nonafluorobutyl, sec-nonafluorobutyl or tert-nonafluorobutyl.

Alk denotes a straight-chain or branched alkyl group having 1 to 12 C atoms, for example methyl, ethyl, isopropyl, propyl, butyl, sec-butyl or tert-butyl, furthermore pentyl, 1-, 2- or 3-methylbutyl, 1,1-, 1,2- or 2,2-dimethyl-propyl, 1-ethylpropyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl or n-dodecyl. A straight-chain or branched alkyl group having 1 to 20 C atoms therefore consists of the said alkyl groups having 1 to 12 C atoms plus n-tridecyl, n-tetracecyl, n-pentadecyl, n-hexadecyl, n-heptadecyl, n-octadecyl, n-nonadecyl or n-eicosyl.

A straight-chain or branched alkenyl having 2 to 20 C atoms, where, in addition, a plurality of double bonds may be present, is, for example, allyl, 2- or 3-butenyl, isobutenyl, sec-butenyl, furthermore 4-pentenyl, isopentenyl, hexenyl, heptenyl, octenyl, —C₉H₁₇, —C₁₀H₁₉ to —C₂₀H₃₉; preferably allyl, 2- or 3-butenyl, isobutenyl, sec-butenyl, preference is furthermore given to 4-pentenyl, isopentenyl, hexenyl or decen-9-yl.

Ar denotes an aryl group having 6 to 12 C atoms, for example phenyl, naphthyl or anthracenyl, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR. The substitution may take place once or a number of times by the substituents indicated, preferably once. The phenyl group is preferably substituted in the 4-position. Ar preferably corresponds to phenyl.

Ac denotes a carboxyl group OC(O)R, where R is as defined below or in other words the radical of a carboxylic acid. The carboxylic acid is in accordance with the invention not restricted with respect to the number of carboxyl groups, i.e. it also preferably includes aliphatic dicarboxylic acids, preferably having 1 to 6 C atoms, for example oxalic acid, malonic acid, succinic acid, glutaric acid or adipic acid. Since the dicarboxylic acids contain two reactive carboxyl groups which are available for a reaction, the compounds of the formula I likewise include the compounds of the formula Ib, as described above.

R′ in the formula Ib denotes a single bond or an alkylene group having 1 to 4 C atoms, i.e. —CH₂—, —(CH₂)₂—, —(CH₂)₃— or —(CH₂)₄—. R′ very particularly preferably stands for a single bond, i.e. complexes of oxalic acid form.

Het denotes a heteroaryl group having 5 to 13 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, where the heteroatom is at least one O, S or N atom. It is also possible for a plurality of heteroatoms to be present. The substitution may take place once or a number of times by the substituents indicated, preferably once.

A straight-chain or branched alkenyl having 2 to 20 C atoms, where, in addition, a plurality of double bonds may be present, is, for example, allyl, 2- or 3-butenyl, isobutenyl, sec-butenyl, furthermore 4-pentenyl, isopentenyl, hexenyl, heptenyl, octenyl, —C₉H₁₇, —C₁₀H₁₉ to —C₂₀H₃₉; preferably allyl, 2- or 3-butenyl, isobutenyl, sec-butenyl, preference is furthermore given to 4-pentenyl, isopentenyl, hexenyl or decenyl.

Hal denotes F, Cl, Br or I, preferably F, Cl or Br, very particularly preferably F.

The number n denotes 1, 2 or 3, preferably 2 or 3, very particularly preferably 3.

R denotes H or a straight-chain or branched alkyl group having 1 to 20 C atoms, which may be partially substituted by Hal, NH₂, NHAlk, NAlk₂, NO₂, CN or SO₃H, or denotes a straight-chain or branched alkenyl group having 2 to 20 C atoms, which may contain a plurality of double bonds, where one or two non-adjacent carbon atoms of the alkyl or alkenyl group which are not bonded to the heteroatom may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, NH, —C(O)—, —O—C(O)— or —C(O)—O—.

The straight-chain or branched alkyl group in the definition of the substituent R preferably stands for a straight-chain or branched alkyl group having 1 to 8 C atoms, which may be partially substituted by Hal, NH₂ or OH and/or where one or two non-adjacent carbon atoms of the alkyl group which are not bonded to the heteroatom may be replaced by atoms and/or atom groups selected from the group —O—, —NH— or —C(O)—O—.

The straight-chain or branched alkenyl group in the definition of the substituent R preferably stands for a straight-chain or branched alkenyl group having 2 to 10 C atoms. The double bond is preferably terminal, for example in the case of dec-9-enyl.

R preferably denotes a straight-chain or branched alkyl group having 1 to 20 C atoms, which may be partially substituted by Hal, NH₂, NHAlk, NAlk₂, NO₂, CN or SO₃H, where one or two non-adjacent carbon atoms of the alkyl or alkenyl group which are not bonded to the heteroatom may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, NH, —C(O)—, —O—C(O)— or —C(O)—O—.

R particularly preferably stands for H, ethyl, 2,2,2-trifluoroethyl, hydroxy-ethyl, dec-9-enyl, —CH₂—CH₂—NH—(CH₂)₃—NH₂, —(CH₂)₅—C(O)—O—CH₂—CH₃, aminoethyl or methoxyethyl.

In the definition of Ac, R preferably stands for a straight-chain or branched alkyl group having 1 to 20 C atoms, particularly preferably for a straight-chain or branched alkyl group having 1 to 8 C atoms.

R_(f) preferably stands, in each case independently of one another, for a straight-chain or branched perfluoroalkyl group having 1 to 8 C atoms, particularly preferably for a straight-chain or branched perfluoroalkyl group having 1 to 4 C atoms, very particularly preferably for a straight-chain or branched perfluoroalkyl group having 2 to 4 C atoms, in particular very particularly preferably for pentafluoroethyl or n-nonafluorobutyl.

All substituents R_(f) are preferably identical.

X preferably stands for OR, Ac or OAr, particularly preferably for OR or Ac, very particularly preferably for OR.

Ac in formula I particularly preferably denotes O—C(O)CH₃. (OC(O)—R′—C(O)O) in formula Ib preferably denotes OC(O)—C(O)O.

OAr in formula I particularly preferably denotes O-phenyl or para-hydroxyphenyl.

If, in the case of the compounds of the formula I, a definition for the substituent X in which terminal OH groups are present is selected, it may be possible for this OH group to react again with the starting material and accordingly for compounds of the formula Ic to arise

x[Kt]^(z+) y[(R_(f))_(n)PF_(5-n)O-A-OF_(5-n)P(R_(f))_(n)]²⁻  Ic,

where x, y, z, Kt, R_(f) and n have a meaning indicated in the case of the formula Ib and A denotes an arylene, heteroarylene, alkylene or alkenylene, corresponding to the descriptions of Ar, Het and R, for example preferably phenylene or ethylene.

Dimeric compounds of the formula Ic of this type are also covered by the formula I. The preparation of the compounds of the formula Ic can be controlled via the synthesis process, as described below.

The cation of the compounds of the formula I, as described above, is a stabilised proton, a metal cation, preferably an alkali-metal cation, an alkaline-earth metal cation or a cation from groups 3 to 12 of the Periodic Table, or an organic cation.

A stabilised proton is in accordance with the invention a proton which is stabilised by an organic base or a basic solvent. In the case of stabilisation by a basic solvent, the term solvated proton can also be used for the term stabilised proton.

Suitable organic bases for stabilisation of the proton in the compounds of the formula I are preferably selected from the group aromatic amine, dialkylformamide or dialkylacetamide, where the alkyl groups of the dialkylformamide or dialkylacetamide each have, independently of one another, 1 to 8 C atoms. The alkyl groups in the dialkylformamide or dialkylacetamide are preferably identical.

Preferred aromatic amines are, for example, pyridine, morpholine, piperazine, imidazole, oxazole or thiazole, each of which may be substituted by alkyl groups having 1 to 8 C atoms or dialkylamino groups, which each have, independently of one another, 1 to 8 C atoms. The aromatic amine is particularly preferably selected from the group pyridine, 4-methylpyridine or 4-dimethylaminopyridine.

Preferred dialkylformamides are, for example, dimethylformamide, diethylformamide, dipropylformamide. A particularly preferred dialkylformamide is dimethylformamide.

Preferred dialkylacetamides are, for example, dimethylacetamide, diethylacetamide or dipropylacetamide.

The proton is particularly preferably stabilised by an aromatic amine or dialkylformamide, as described above.

The proton is very particularly preferably stabilised by 4-dimethylaminopyridine or dimethylformamide. The proton is in particular very particularly preferably stabilised by 4-dimethylaminopyridine.

Suitable basic solvents for stabilisation of the proton in the compounds of the formula I are preferably selected from water, dialkyl ethers containing alkyl groups, which each have, independently of one another, 1 to 4 C atoms, aliphatic alcohols having 1 to 8 C atoms, ethyl acetate, acetonitrile, dimethyl sulfoxide or N-alkyl-2-pyrrolidone, where the alkyl group has 1 to 8 C atoms.

Preferred N-alkyl-2-pyrrolidones are, for example, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-propyl-2-pyrrolidone or N-butyl-2-pyrrolidone.

There are no restrictions per se regarding the choice of the organic cation of the compound of the formula I or Ib or Ic in accordance with the resent invention. The organic cations are preferably selected from the group comprising ammonium, sulfonium, oxonium, phosphonium, uronium, thiouronium, guanidinium cations or are heterocyclic cations. Examples of organic cations are also polyammonium ions having a degree of charging z=4. Selected organic cations are represented by the formulae (1) to (8).

Ammonium cations can be described, for example, by the formula (1), sulfonium cations can be described, for example, by formula (2) or oxonium cations can be described, for example, by the formula (3),

[N(R⁰)₄]⁺  (1)

[S(R⁰)₃]⁺  (2)

or

[O(R⁰)₃]  (3),

where R⁰ in each case, independently of one another, denotes

-   -   H, where all substituents R⁰ in the formula (2) cannot         simultaneously be H,     -   straight-chain or branched alkyl having 1-20 C atoms,     -   straight-chain or branched alkenyl having 2-20 C atoms and one         or more double bonds,     -   straight-chain or branched alkynyl having 2-20 C atoms and one         or more triple bonds,     -   saturated or partially unsaturated cycloalkyl having 3-7 C         atoms, which may be substituted by straight-chain or branched         alkyl groups having 1-6 C atoms,     -   aryl having 6 to 12 C atoms, which may be substituted by         straight-chain or branched alkyl groups having 1-6 C atoms,         where R₀ may be partially substituted by halogen or partially         substituted by —OR¹, —C(O)OR¹, —OC(O)R¹, —OC(O)OR¹, —C(O)NR¹ ₂         or —SO₂NR¹ ₂,         and where one or two non-adjacent carbon atoms of the radical R₀         which are not in the α-position may be replaced by atoms and/or         atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—,         —N⁺(R¹)₂—, —C(O)NR¹—, —SO₂NR¹— or —P(O)R¹—, in which R¹ stands         for H, non- or partially fluorinated straight-chain or branched         C₁- to C₆-alkyl, C₃- to C₇-cycloalkyl, unsubstituted or         substituted phenyl.

Phosphonium cations can be described, for example, by the formula (4),

[P(R²)₄]⁺  (4),

where R² in each case, independently of one another, denotes

-   -   N(R¹*)₂,     -   straight-chain or branched alkyl having 1-20 C atoms,     -   straight-chain or branched alkenyl having 2-20 C atoms and one         or more double bonds,     -   straight-chain or branched alkynyl having 2-20 C atoms and one         or more triple bonds,     -   saturated or partially unsaturated cycloalkyl having 3-7 C         atoms, which may be substituted by straight-chain or branched         alkyl groups having 1-6 C atoms,     -   aryl having 6 to 12 C atoms, which may be substituted by         straight-chain or branched alkyl groups having 1-6 C atoms,         where R² may be partially substituted by halogen, or partially         substituted by —OR¹, —C(O)OR¹, —OC(O)R¹, —OC(O)OR¹, —C(O)NR¹ ₂         or —SO₂NR¹ ₂,         and where one or two non-adjacent carbon atoms of the R² which         are not in the α-position may be replaced by atoms and/or atom         groups selected from the group —O—, —S—, —S(O)— or —SO₂—, in         which R¹ stands for H, non- or partially fluorinated         straight-chain or branched C₁- to C₆-alkyl, C₃- to         C₇-cycloalkyl, unsubstituted or substituted phenyl and R¹*         stands for non- or partially fluorinated straight-chain or         branched C₁- to C₆-alkyl, C₃- to C₇-cycloalkyl, unsubstituted or         substituted phenyl.

Uronium cations can be described, for example, by the formula (5) or thiouronium cations can be described, for example, by the formula (6),

[C(NR³R⁴)(OR⁵)(NR⁶R⁷)]⁺  (5)

or

[C(NR³R⁴)(SR⁵)(NR⁶R⁷)]⁺  (6),

where R³ to R⁷ each, independently of one another, denote

-   -   H or N(R¹*)₂,     -   straight-chain or branched alkyl having 1 to 20 C atoms,     -   straight-chain or branched alkenyl having 2-20 C atoms and one         or more double bonds,     -   straight-chain or branched alkynyl having 2-20 C atoms and one         or more triple bonds,     -   saturated or partially unsaturated cycloalkyl having 3-7 C         atoms, which may be substituted by straight-chain or branched         alkyl groups having 1-6 C atoms,     -   aryl having 6 to 12 C atoms, which may be substituted by         straight-chain or branched alkyl groups having 1-6 C atoms,         where one or more of the substituents R³ to R⁷ may be partially         substituted by halogen, or partially substituted by —OH, —OR¹,         —CN, —C(O)NR¹ ₂, —SO₂NR¹ ₂,         and where one or two non-adjacent carbon atoms of R³ to R⁷ which         are not in the α-position may be replaced by atoms and/or atom         groups selected from the group —O—, —S—, —S(O)—, —SO₂—,         —N⁺(R¹)₂—, —C(O)NR¹—, —SO₂NR¹—, or —P(O)R¹—, in which R¹ stands         for H, non- or partially fluorinated straight-chain or branched         C₁- to C₆-alkyl, C₃- to C₇-cycloalkyl, unsubstituted or         substituted phenyl and R¹*stands for non- or partially         fluorinated straight-chain or branched C₁- to C₆-alkyl, C₃- to         C₇-cycloalkyl, unsubstituted or substituted phenyl.

Guanidinium cations can be described, for example, by the formula (7),

[C(NR⁸R⁹)(NR¹⁰R¹¹)(NR¹²R¹³)]⁺  (7),

where R⁸ to R¹³ each, independently of one another, denote

-   -   H or N(R¹*)₂,     -   straight-chain or branched alkyl having 1 to 20 C atoms,     -   straight-chain or branched alkenyl having 2-20 C atoms and one         or more double bonds,     -   straight-chain or branched alkynyl having 2-20 C atoms and one         or more triple bonds,     -   saturated or partially unsaturated cycloalkyl having 3-7 C         atoms, which may be substituted by straight-chain or branched         alkyl groups having 1-6 C atoms,     -   aryl having 6 to 12 C atoms, which may be substituted by         straight-chain or branched alkyl groups having 1-6 C atoms,         where one or more of the substituents R⁸ to R¹³ may be partially         substituted by halogen, or partially substituted by —OR¹, —CN,         —C(O)NR¹ ₂, —SO₂NR¹ ₂, and where one or two non-adjacent carbon         atoms of R⁸ to R¹³ which are not in the α-position may be         replaced by atoms and/or atom groups selected from the group         —O—, —S—, —S(O)—, —SO₂—, —N⁺(R¹)₂—, —C(O)NR¹—, —SO₂NR¹—, or         —P(O)R¹—, in which R¹ stands for H, non- or partially         fluorinated straight-chain or branched C₁- to C₆-alkyl, C₃- to         C₇-cycloalkyl, unsubstituted or substituted phenyl and R¹*         stands for non- or partially fluorinated straight-chain or         branched C₁- to C₆-alkyl, C₃- to C₇-cycloalkyl, unsubstituted or         substituted phenyl.

Heterocyclic cations can be described, for example, by the formula (8)

[HetN]⁺  (8),

where [HetN]⁺ is a heterocyclic cation selected from the group comprising

where the substituents R^(1′) to R^(4′) each, independently of one another, denote

-   -   H,     -   straight-chain or branched alkyl having 1-20 C atoms, which may         also be fluorinated or perfluorinated,     -   straight-chain or branched alkenyl having 2-20 C atoms and one         or more double bonds, which may also be fluorinated or         perfluorinated,     -   straight-chain or branched alkynyl having 2-20 C atoms and one         or more triple bonds, which may also be fluorinated,     -   saturated or partially unsaturated cycloalkyl having 3-7 C         atoms, which may be substituted by straight-chain or branched         alkyl groups having 1-6 C atoms,     -   aryl having 6 to 12 C atoms, which may be substituted by         straight-chain or branched alkyl groups having 1-6 C atoms,     -   saturated, partially or fully unsaturated heteroaryl,         heteroaryl-C₁-C₆-alkyl or aryl-C₁-C₆-alkyl,         where the substituents R^(1′), R^(2′), R^(3′) and/or R^(4′)         together may form a ring system,         where one, two or three substituents R^(1′) to R^(4′) may be         partially or fully substituted by halogens or partially by —OR¹,         —CN, —C(O)NR¹ ₂, —SO₂NR¹ ₂, where the substituents R^(1′) and         R^(4′) cannot be substituted simultaneously and fully by         halogens, and where one or two non-adjacent carbon atoms of the         substituents R^(1′) to R^(4′) which are not bonded to the         heteroatom may be replaced by atoms and/or atom groups selected         from the group —O—, —S—, —S(O)—, —SO₂—, —N⁺(R¹)₂—, —C(O)NR¹—,         —SO₂NR¹—, or —P(O)R¹—,         in which R¹ stands for H, non- or partially fluorinated         straight-chain or branched C₁- to C₆-alkyl, C₃- to         C₇-cycloalkyl, unsubstituted or substituted phenyl and R¹*         stands for non- or partially fluorinated straight-chain or         branched C₁- to C₆-alkyl, C₃- to C₇-cycloalkyl, unsubstituted or         substituted phenyl.

Suitable substituents R₀ and R² to R¹³ of the compounds of the formulae (1) to (7) are preferably in accordance with the invention: H, straight-chain or branched C₁- to C₂₀-, in particular straight-chain or branched C₁- to C₁₄-alkyl groups, saturated C₃- to C₇-cycloalkyl groups, which may be substituted by straight-chain or branched C₁- to C₆-alkyl groups, or phenyl, which may be substituted by straight-chain or branched C₁- to C₆-alkyl groups.

The substituents R⁰ and R² in the compounds of the formula (2), (3) or (4) may be identical or different. In the case of compounds of the formulae (2), all substituents R⁰ are preferably identical or two are identical and one substituent is different. In the case of compounds of the formula (3), all substituents R⁰ are preferably identical. In the case of compounds of the formula (4), three or four substituents R² are preferably identical.

The substituents R⁰ and R² are particularly preferably methyl, ethyl, isopropyl, propyl, butyl, sec-butyl, pentyl, hexyl, octyl, decyl or tetradecyl.

Up to four substituents of the guanidinium cation [C(NR⁸R⁹)(NR¹⁰R¹¹)(NR¹²R¹³)]⁺ may also be connected in pairs in such a way that mono-, bi- or polycyclic molecules arise.

Without restricting generality, examples of such guanidinium cations are:

where the substituents R⁸ to R¹⁰ and R¹³ can have a meaning or particularly preferred meaning indicated above.

If desired, the carbocycles or heterocycles of the guanidinium cations indicated above may also be substituted by straight-chain or branched C₁- to C₆-alkyl, C₁- to C₆-alkenyl, CN, NR¹ ₂, F, Cl, Br, I, straight-chain or branched C₁-C₆-alkoxy, SCF₃, SO₂CF₃ or SO₂NR¹ ₂, where R¹ has a meaning indicated above, substituted or unsubstituted phenyl or an unsubstituted or substituted heterocycle.

Up to four substituents of the thiouronium cation [C(NR³R⁴)(SR⁵)(NR⁶R⁷)]⁺ may also be bonded in pairs in such a way that mono-, bi- or polycyclic molecules are formed.

Without restricting generality, examples of such thiouronium cations are indicated below:

in which Y═S and where the substituents R³, R⁵ and R⁶ can have a meaning or particularly preferred meaning indicated above.

If desired, the carbocycles or heterocycles of the molecules indicated above may also be substituted by straight-chain or branched C₁- to C₆-alkyl, C₁- to C₆-alkenyl, CN, NR¹ ₂, F, Cl, Br, I, straight-chain or branched C₁-C₆-alkoxy, SCF₃, SO₂CF₃ or SO₂NR¹ ₂ or substituted or unsubstituted phenyl or an unsubstituted or substituted heterocycle, where R¹ has a meaning indicated above.

The substituents R³ to R¹³ are each, independently of one another, preferably a straight-chain or branched alkyl group having 1 to 10 C atoms. The substituents R³ and R⁴, R⁶ and R⁷, R⁸ and R⁹, R¹⁰ and R¹¹ and R¹² and R¹³ in compounds of the formulae (5) to (7) may be identical or different. R³ to R¹³ are particularly preferably each, independently of one another, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, sec-butyl, phenyl or cyclohexyl, very particularly preferably methyl, ethyl, n-propyl, isopropyl or n-butyl.

In accordance with the invention, suitable substituents R^(1′) and R^(4′) of compounds of the formula (8) are preferably: straight-chain or branched C₁- to C₂₀, in particular straight-chain or branched C₁- to C₁₂-alkyl groups, saturated C₃- to C₇-cycloalkyl groups, which may be substituted by straight-chain or branched C₁- to C₆-alkyl groups, or phenyl, which may be substituted by straight-chain or branched C₁- to C₆-alkyl groups.

In accordance with the invention, suitable substituents R^(2′) and R^(3′) of compounds of the formula (8), besides H, are preferably: straight-chain or branched C₁- to C₂₀, in particular straight-chain or branched C₁- to C₁₂-alkyl groups.

The substituents R^(1′) and R^(4′) are each, independently of one another, particularly preferably methyl, ethyl, isopropyl, propyl, butyl, sec-butyl, pentyl, hexyl, octyl, decyl, cyclohexyl, phenyl or benzyl. They are very particularly preferably methyl, ethyl, n-butyl or hexyl. In pyrrolidine, piperidine, indoline, pyrrolidinium, piperidinium or indolinium compounds, the two substituents R^(1′) and R^(4′) are preferably different.

The substituent R^(2′) or R^(3′) is in each case, independently of one another, in particular H, methyl, ethyl, isopropyl, propyl, butyl, sec-butyl, tert-butyl, cyclohexyl, phenyl or benzyl. R^(2′) is particularly preferably H, methyl, ethyl, isopropyl, propyl, butyl or sec-butyl. R^(2′) and R^(3′) are very particularly preferably H.

A straight-chain or branched alkynyl having 2 to 20 C atoms, in which a plurality of triple bonds may also be present, is, for example, ethynyl, 1- or 2-propynyl, 2- or 3-butynyl, furthermore 4-pentynyl, 3-pentynyl, hexynyl, heptynyl, octynyl, —C₉H₁₅, —C₁₀H₁₇ to —C₂₀H₃₇, preferably ethynyl, 1- or 2-propynyl, 2- or 3-butynyl, 4-pentynyl, 3-pentynyl or hexynyl. If the compounds are partially fluorinated, at least one H atom is replaced by an F atom. If the compounds are perfluorinated, all H atoms of the corresponding alkyl group are replaced by F atoms.

Aryl-C₁-C₆-alkyl denotes, for example, benzyl, phenylethyl, phenylpropyl, phenylbutyl, phenylpentyl or phenylhexyl, where both the phenyl ring and also the alkylene chain may be partially or fully substituted, as described above, by halogens, in particular —F and/or —Cl, or partially by —OR¹, —NR¹ ₂, —CN, —C(O)NR¹ ₂, —SO₂NR¹ ₂

Unsubstituted saturated or partially unsaturated cycloalkyl groups having 3-7 C atoms are therefore cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclopentenyl, cyclohexenyl or cycloheptenyl, each of which may be substituted by C₁- to C₆-alkyl groups, where the cycloalkyl group or the cycloalkyl group substituted by C₁- to C₆-alkyl groups may in turn also be substituted by halogen atoms, such as F, Cl, Br or I, in particular F or Cl, or by —OR¹, —CN, —C(O)NR¹ ₂, —SO₂NR¹ ₂.

In the substituents R⁰, R³ to R¹³ or R^(1′) to R^(4′), one or two non-adjacent carbon atoms which are not bonded in the α-position to the heteroatom may also be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, —N⁺(R¹)₂—, —C(O)NR¹—, —SO₂NR¹—, or —P(O)R¹—, where R¹═H, non- or partially fluorinated straight-chain or branched C₁- to C₆-alkyl, C₂- to C₇-cycloalkyl, unsubstituted or substituted phenyl.

Without restricting generality, examples of substituents R⁰, R² to R¹³ and R^(1′) to R^(4′) modified in this way are:

—OCH₃, —OCH(CH₃)₂, —CH₂OCH₃, —CH₂—CH₂—O—CH₃, —C₂H₄OCH(CH₃)₂, —C₂H₄SC₂H₅, —C₂H₄SCH(CH₃)₂, —S(O)CH₃, —SO₂CH₃, —SO₂C₆H₅, —SO₂C₃H₇, —SO₂CH(CH₃)₂, —SO₂CH₂CF₃, —CH₂SO₂CH₃, —O—C₄H₈—O—C₄H₉, —CF₂SO₂CF₃, —C₂F₄N(C₂F₅)C₂F₅, —CHF₂, —CH₂CF₃, —C₂F₂H₃, —C₃H₆, —CH₂C₃F₇, —C(CFH₂)₃, —CH₂C₆H₅ or P(O)(C₂H₅)₂.

In R¹, C₃- to C₇-cycloalkyl is, for example, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl or cycloheptyl.

In R¹, substituted phenyl denotes phenyl which is substituted by C₁- to C₆-alkyl, C₁- to C₆-alkenyl, F, Cl, Br, I, —C₁-C₆-alkoxy, NR″₂, —SR″, —S(O)R″, —SO₂R″ or SO₂NR″₂, where R* denotes F, Cl or Br and R″ denotes a non-, partially or perfluorinated C₁- to C₆-alkyl or C₃- to C₇-cycloalkyl as defined for R¹, for example o-, m- or p-methylphenyl, o-, m- or p-ethylphenyl, o-, m- or p-propylphenyl, o-, m- or p-isopropylphenyl, o-, m- or p-tert-butylphenyl, o-, m- or p-methoxyphenyl, o-, m- or p-ethoxyphenyl, o-, m- or p-fluorophenyl, o-, m- or p-chlorophenyl, o-, m- or p-bromophenyl, o-, m- or p-iodophenyl, further preferably 2,3-, 2,4-, 2,5-, 2,6-, 3,4- or 3,5-dimethylphenyl, 2,3-, 2,4-, 2,5-, 2,6-, 3,4- or 3,5-difluorophenyl, 2,3-, 2,4-, 2,5-, 2,6-, 3,4- or 3,5-dichlorophenyl, 2,3-, 2,4-, 2,5-, 2,6-, 3,4- or 3,5-dibromophenyl, 2,3-, 2,4-, 2,5-, 2,6-, 3,4- or 3,5-dimethoxyphenyl, 5-fluoro-2-methylphenyl, 3,4,5-trimethoxyphenyl or 2,4,5-trimethylphenyl.

In R^(1′) to R^(4′), heteroaryl is taken to mean a saturated or unsaturated mono- or bicyclic heterocyclic radical having 5 to 13 ring members, in which 1, 2 or 3 N and/or 1 or 2 S or O atoms may be present and the heterocyclic radical may be mono- or polysubstituted by C₁- to C₆-alkyl, C₁- to C₆-alkenyl, CN, NR¹ ₂, F, Cl, Br, I, C₁-C₆-alkoxy, SCF₃, SO₂CF₃ or SO₂NR¹ ₂, where R¹ has a meaning indicated above.

The heterocyclic radical or Het is preferably substituted or unsubstituted 2- or 3-furyl, 2- or 3-thienyl, 1-, 2- or 3-pyrrolyl, 1-, 2-, 4- or 5-imidazolyl, 3-, 4- or 5-pyrazolyl, 2-, 4- or 5-oxazolyl, 3-, 4- or 5-isoxazolyl, 2-, 4- or 5-thiazolyl, 3-, 4- or 5-isothiazolyl, 2-, 3- or 4-pyridyl, 2-, 4-, 5- or 6-pyrimidinyl, furthermore preferably 1,2,3-triazol-1-, -4- or -5-yl, 1,2,4-triazol-1-, -4- or -5-yl, 1- or 5-tetrazolyl, 1,2,3-oxadiazol-4- or -5-yl, 1,2,4-oxadiazol-3- or -5-yl, 1,3,4-thiadiazol-2- or -5-yl, 1,2,4-thiadiazol-3- or -5-yl, 1,2,3-thiadiazol-4- or -5-yl, 2-, 3-, 4-, 5- or 6-2H-thiopyranyl, 2-, 3- or 4-4H-thiopyranyl, 3- or 4-pyridazinyl, pyrazinyl, 2-, 3-, 4-, 5-, 6- or 7-benzofuryl, 2-, 3-, 4-, 5-, 6- or 7-benzothienyl, 1-, 2-, 3-, 4-, 5-, 6- or 7-1H-indolyl, 1-, 2-, 4- or 5-benzimidazolyl, 1-, 3-, 4-, 5-, 6- or 7-benzopyrazolyl, 2-, 4-, 5-, 6- or 7-benzoxazolyl, 3-, 4-, 5-, 6- or 7-benzisoxazolyl, 2-, 4-, 5-, 6- or 7-benzothiazolyl, 2-, 4-, 5-, 6- or 7-benzisothiazolyl, 4-, 5-, 6- or 7-benz-2,1,3-oxadiazolyl, 1-, 2-, 3-, 4-, 5-, 6-, 7- or 8-quinolinyl, 1-, 3-, 4-, 5-, 6-, 7- or 8-isoquinolinyl, 1-, 2-, 3-, 4- or 9-carbazolyl, 1-, 2-, 3-, 4-, 5-, 6-, 7-, 8- or 9-acridinyl, 3-, 4-, 5-, 6-, 7- or 8-cinnolinyl, 2-, 4-, 5-, 6-, 7- or 8-quinazolinyl or 1-, 2- or 3-pyrrolidinyl.

Heteroaryl-C₁-C₆-alkyl is, analogously to aryl-C₁-C₆-alkyl, taken to mean, for example, pyridinylmethyl, pyridinylethyl, pyridinylpropyl, pyridinylbutyl, pyridinylpentyl, pyridinylhexyl, where the heterocycles described above may furthermore be linked to the alkylene chain in this way.

HetN⁺ is preferably

where the substituents R^(1′) to R^(4′) each, independently of one another, have a meaning described above.

The organic cation [Kt]^(x+) is particularly preferably selected from the group comprising imidazolium, pyridinium, pyrrolidinium, ammonium or phosphonium cations, as defined above.

Particularly suitable cations are selected from the group tetraalkylammonium, 1,1-dialkylpyrrolidinium, 1-alkyl-1-alkoxyalkylpyrrolidnium or 1,3-dialkylimidazolium, where the alkyl groups or the alkoxy group in the alkoxyalkyl group may each, independently of one another, have 1 to 10 C atoms. The alkly groups very particularly preferably have 1 to 6 C atoms and the alkoxy group very particularly preferably has 1 to 3 C atoms. The alkyl groups in tetraalkylammonium may therefore be identical or different. Preferably, three alkyl groups are identical and one alkyl group is different or two alkyl groups are identical and the other two are different. Preferred tetraalkylammonium cations are, for example, trimethyl(ethyl)-ammonium, triethyl(methyl)ammonium, tripropyl(methyl)ammonium, tributyl-(methyl)ammonium, tripentyl(methyl)ammonium, trihexyl(methyl)ammonium, triheptyl(methyl)ammonium, trioctyl(methyl)ammonium, trinonyl-(methyl)ammonium, tridecyl(methyl)ammonium, trihexyl(ethyl)ammonium, ethyl(trioctyl)ammonium, propyl(dimethyl)ethylammonium, butyl(dimethyl)-ethylammonium, methoxyethyl(dimethyl)ethylammonium, methoxyethyl-(diethyl)methylammonium, methoxyethyl(dimethyl)propylammonium, ethoxyethyl(dimethyl)ethylammonium. Particularly preferred quaternary ammonium cations are propyl(dimethyl)ethylammonium and/or methoxyethyl(dimethyl)ethylammonium.

Preferred 1,1-dialkylpyrrolidinium cations are, for example, 1,1-dimethylpyrrolidinium, 1-methyl-1-ethylpyrrolidinium, 1-methyl-1-propylpyrrolidinium, 1-methyl-1-butylpyrrolidinium, 1-methyl-1-pentylpyrrolidinium, 1-methyl-1-hexylpyrrolidinium, 1-methyl-1-heptylpyrrolidinium, 1-methyl-1-octylpyrrolidinium, 1-methyl-1-nonylpyrrolidinium, 1-methyl-1-decylpyrrolidinium, 1,1-diethylpyrrolidinium, 1-ethyl-1-propylpyrrolidinium, 1-ethyl-1-butylpyrrolidinium, 1-ethyl-1-pentylpyrrolidinium, 1-ethyl-1-hexylpyrrolidinium, 1-ethyl-1-heptylpyrrolidinium, 1-ethyl-1-octylpyrrolidinium, 1-ethyl-1-nonylpyrrolidinium, 1-ethyl-1-decylpyrrolidinium, 1,1-dipropylpyrrolidinium, 1-propyl-1-methylpyrrolidinium, 1-propyl-1-butylpyrrolidinium, 1-propyl-1-pentylpyrrolidinium, 1-propyl-1-hexylpyrrolidinium, 1-propyl-1-heptylpyrrolidinium, 1-propyl-1-octylpyrrolidinium, 1-propyl-1-nonylpyrrolidinium, 1-propyl-1-decylpyrrolidinium, 1,1-dibutylpyrrolidinium, 1-butyl-1-methylpyrrolidinium, 1-butyl-1-pentylpyrrolidinium, 1-butyl-1-hexylpyrrolidinium, 1-butyl-1-heptylpyrrolidinium, 1-butyl-1-octylpyrrolidinium, 1-butyl-1-nonylpyrrolidinium, 1-butyl-1-decylpyrrolidinium, 1,1-dipentylpyrrolidinium, 1-pentyl-1-hexylpyrrolidinium, 1-pentyl-1-heptylpyrrolidinium, 1-pentyl-1-octylpyrrolidinium, 1-pentyl-1-nonylpyrrolidinium, 1-pentyl-1-decylpyrrolidinium, 1,1-dihexylpyrrolidinium, 1-hexyl-1-heptylpyrrolidinium, 1-hexyl-1-octylpyrrolidinium, 1-hexyl-1-nonylpyrrolidinium, 1-hexyl-1-decylpyrrolidinium, 1,1-dihexylpyrrolidinium, 1-hexyl-1-heptylpyrrolidinium, 1-hexyl-1-octylpyrrolidinium, 1-hexyl-1-nonylpyrrolidinium, 1-hexyl-1-decylpyrrolidinium, 1,1-diheptylpyrrolidinium, 1-heptyl-1-octylpyrrolidinium, 1-heptyl-1-nonylpyrrolidinium, 1-heptyl-1-decylpyrrolidinium, 1,1-dioctylpyrrolidinium, 1-octyl-1-nonylpyrrolidinium, 1-octyl-1-decylpyrrolidinium, 1-1-dinonylpyrrolidinium, 1-nony-1-decylpyrrolidinium or 1,1-didecylpyrrolidinium. Very particular preference is given to 1-butyl-1-methylpyrrolidinium or 1-propyl-1-methylpyrrolidinium.

Preferred 1-alkyl-1-alkoxyalkylpyrrolidinium cations are, for example, 1-methoxyethyl-1-methylpyrrolidinium, 1-methoxyethyl-1-ethylpyrrolidinium, 1-methoxyethyl-1-propylpyrrolidinium, 1-methoxyethyl-1-butylpyrrolidinium, 1-ethoxyethyl-1-methylpyrrolidinium, 1-ethoxymethyl-1-methylpyrrolidinium. Very particular preference is given to 1-methoxyethyl-1-methylpyrrolidinium.

Preferred 1,3-dialkylimidazolium cations are, for example, 1-ethyl-3-methylimidazolium, 1-methyl-3-propylimidazolium, 1-butyl-3-methylimidazolium, 1-methyl-3-pentylimidazolium, 1-ethyl-3-propylimidazolium, 1-butyl-3-ethylimidazolium, 1-ethyl-3-pentylimidazolium, 1-butyl-3-propylimidazolium, 1,3-dimethylimidazolium, 1,3-diethylimidazolium, 1,3-dipropypylimidazolium, 1,3-dibutylimidazolium, 1,3-dipentylimidazolium, 1,3-dihexylimidazolium, 1,3-diheptylimidazolium, 1,3-dioctylimidazolium, 1,3-dinonylimidazolium, 1,3-didecylimidazolium, 1-hexyl-3-methylimidazolium, 1-heptyl-3-methylimidazolium, 1-methyl-3-octylimidazolium, 1-methyl-3-nonylimidazolium, 1-decyl-3-methylimidazolium, 1-ethyl-3-hexylimidazolium, 1-ethyl-3-heptylimidazolium, 1-ethyl-3-octylimidazolium, 1-ethyl-3-nonylimidazolium or 1-decyl-3-ethylimidazolium. Particularly preferred cations are 1-ethyl-3-methylimidazolium, 1-butyl-3-methylimidazolium or 1-methyl-3-propylimidazolium.

Particularly preferred 1-alkenyl-3-alkylimidazolium cations are 1-allyl-3-methylimidazolium or 1-allyl-2,3-dimethylimidazolium.

The organic cations of the compounds of the formula I are preferably heterocyclic cations of the formula (8), where HetN^(z+) is imidazolium, pyrrolidinium or pyridinium, with substituents R^(1′) to R^(4′), each of which has, independently of one another, a meaning indicated or indicated as preferred. The organic cation of the compounds of the formula I are particularly preferably imidazolium, where the substituents R^(1′) to R^(4′) have a meaning mentioned above or a meaning indicated as preferred or they have the meaning of the meanings preferably indicated for 1,1-dialkylpyrrolidinium, 1-alkyl-1-alkoxyalkylalkylpyrrolidinium, 1,3-dialkylimidazolium, 1-alkenyl-3-alkylimidazolium or 1-alkoxyalkyl-3-alkylimidazolium, as described above.

Particularly preferred organic cations of the formula I are accordingly 1-butyl-1-methylpyrrolidinium, 1-ethyl-3-methylimidazolium, 1-ethyl-2,3-dimethylimidazolium, 1-butyl-2,3-dimethylimidazolium, 1-(2-methoxyethyl)-3-methylimidazolium, 1-butyl-3-methylimidazolium, tributylmethylammonium, tetra-n-butylammonium, tributylmethylphosphonium, tetraphenylphosphonium, tetrabutylphosphonium, diethylmethylsulfonium, S-ethyl-N,N,N′,N′-tetramethylisothiouronium, 1-allyl-3-methylimidazolium, 1-allyl-2,3-dimethylimidazolium, 1-cyanomethyl-3-methylimidazolium, 1-(2-cyanoethyl)-3-methylimidazolium, 1-methyl-3-propynylimidazlium, 1-butyl-4-methylpyridinum, 1,1-dimethylpyrrolidinium or trimethylsulfonium.

An alkali-metal cation is a lithium cation, a sodium cation, a potassium cation, a rubidium cation or a caesium cation, in particular a lithium cation, a sodium cation or a potassium cation.

An alkaline-earth metal cation is a magnesium cation, a calcium cation, a strontium cation or a barium cation, preferably a magnesium cation or a calcium cation.

A metal cation from group 3 to 12 of the Periodic Table is, for example, a cation of the metals silver, copper, yttrium, ytterbium, lanthanum, scandium, cerium, neodymium, terbium, samarium, rhodium, rhutenium, iridium, palladium, platinum, osmium, cobalt, nickel, iron, chromium, molybdenum, tungsten, vanadium, titanium, zirconium, hafnium, thorium, uranium or gold, where the corresponding metal cations in solvated form or stabilised by ligands are also included.

Particularly preferred metal cations are Li, Na⁺, K⁺, Mg²⁺, Ca²⁺, Ag⁺, Cu⁺, Y⁺³, Yb⁺³, La⁺³, Sc⁺³, Ce⁺², Pt⁺² or Pd⁺²

A suitable starting material for the synthesis of the compounds of the formula I are fluoroalkylfluorophosphoranes.

The invention accordingly furthermore relates to a process for the preparation of compounds of the formula I, as described above, where Kt denotes a proton which is stabilised by an organic base, characterised in that a fluoroalkylfluorophosphorane of the formula II

(R_(f))_(n)PF_(5-n)  II,

where R_(f) in each case, independently of one another, denotes a straight-chain or branched fluoroalkyl group having 1 to 8 C atoms and n denotes 1, 2 or 3, is reacted with an organic base, where a compound of the formula IIIa, IIIb or IIIc arises

where R_(f) in each case, independently of one another, has a meaning indicated above and the compound of the formula IIIa, IIIb or IIIc or a tautomeric or stereoisomeric form thereof is subsequently reacted with HX, where X denotes OR, Ac, OAr or OHet, Ac denotes a carboxyl group OC(O)R, Alk denotes a straight-chain or branched alkyl group having 1 to 12 C atoms, Ar denotes an aryl group having 6 to 12 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, Het denotes a heteroaryl group having 5 to 13 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, R denotes H or a straight-chain or branched alkyl group having 1 to 20 C atoms, which may be partially substituted by Hal, NH₂, NHAlk, NAlk₂, NO₂, CN or SO₃H, or denotes a straight-chain or branched alkenyl group having 2 to 20 C atoms, which may contain a plurality of double bonds, where one or two non-adjacent carbon atoms of the alkyl or alkenyl group which are not bonded to the heteroatom may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, NH, —C(O)—, —O—C(O)— or —C(O)—O—. HX in this process may also be an aliphatic dicarboxylic acid, where this reaction results in compounds of the formula Ib, as described above in the case of the compounds of the formula I. The preparation of perfluoroalkylfluorophosphoranes of the formula II can be carried out by conventional methods known to the person skilled in the art. These compounds are preferably prepared by electrochemical fluorination of suitable starting compounds [V. Y. Semenii et al., 1985, Zh. Obshch. Khim. 55 (12): 2716-2720; N. V. Ignatyev, P. Sartori, 2000, J. Fluorine Chem. 103: 57-61; WO 00/21969].

Fluoroalkylfluorophosphoranes can be obtained by free-radical addition of dialkyl phosphites, (RO)₂P(O)H or phosphines onto fluoroolefins [N. O. Brace, J. Org. Chem., 26 (1961), p. 3197-3201; P. Cooper, R. Fields, R. N. Haszeldine, J. Chem. Soc., Perkin 1, 1975, p. 702-707; G. M. Burch, H. Goldwhite, R. N. Haszeldine, J. Chem. Soc., 1963, p. 1083-1091] or to fluoroalkylolefins see P. Kirsch, Modern Fluoroorganic Chemistry, WILEY-VCH, 2004, p. 174], following a chlorination/fluorination or an oxidative fluorination.

The reaction of the phosphorane of the formula II with the organic base, in particular the organic bases, as described above or as preferably described, is carried out at temperatures of 0 to 80° C., preferably 15 to 30° C., in the presence of an organic solvent and in a water-free atmosphere.

Suitable solvents here are acetonitrile, dioxane, dichloromethane, dimethoxyethane, dimethyl sulfoxide, tetrahydrofuran or dialkyl ethers, for example diethyl ether or methyl t-butyl ether.

The compounds of the formulae IIIa, IIIb or IIIc can be isolated, but are preferably not isolated, but instead reacted further in a subsequent reaction, without work-up of the reaction mixture, with the compound HX, where X has a meaning indicated above or described as preferred.

The reaction temperature of the reaction with the compound HX is also 0 to 80° C., preferably 15 to 30° C., particularly preferably room temperature. If the compound HX carries more than one OH group, then, depending on the molar amount of the compound HX, only one OH group reacts with the phosphorane of the formula II, or a plurality of OH groups react with the phosphorane of the formula II. Examples in this respect are described in the example part.

Starting from the compounds of the formula I, where the cation is a proton which is stabilised by an organic base, it is then possible to prepare the compounds of the formula I with the cations selected from proton which is stabilised by basic solvents (solvated), metal cation or organic cations, as described above.

This is carried out classically for the metal cations or organic cations by a salt-exchange reaction.

The compounds of the formula I which have a proton which is stabilised by a basic solvent may also be formed in the process already described, depending on whether the affinity of the proton is preferably with the basic solvent or the organic base. The invention therefore furthermore relates to a process for the preparation of compounds of the formula I, as described above, where Kt denotes a metal cation or an organic cation, by a salt-exchange reaction, characterised in that a compound of the formula I, where Kt denotes a proton which is stabilised by a base, prepared by the process described above, is reacted with a compound of the formula IV

KtA  IV,

where Kt denotes a metal cation or an organic cation, as described above or as preferably described, and A denotes an anion selected from Cl⁻, Br⁻, I⁻, OH⁻, [R₁COO]⁻, [R₁SO₃]⁻, [R₂COO]⁻, [R₂SO₃]⁻, [R₁OSO₃]⁻, [BF₄]⁻, [SO₄]²⁻, [HSO₄]¹⁻, [NO₃]⁻, [(R₂)₂P(O)O]⁻, [R₂P(O)O₂]²⁻ or [CO₃]²⁻, where R₁ in each case, independently of one another, denotes straight-chain or branched alkyl having 1 to 4 C atoms and R₂ in each case, independently of one another, denotes straight-chain or branched perfluorinated alkyl having 1 to 4 C atoms, where the electroneutrality of the salts of the formula KtA must be observed.

The salt-exchange reaction is advantageously carried out in water, where temperatures of 0°-100° C., preferably 15-60° C., are suitable. The reaction is particularly preferably carried out at room temperature (25° C.).

However, the reaction may alternatively also be carried out in organic solvents at temperatures between −30° and 100° C. Suitable solvents here are acetonitrile, dioxane, dichloromethane, dimethoxyethane, dimethyl sulfoxide, tetrahydrofuran, dimethylformamide or alcohol, for example methanol, ethanol or isopropanol.

The salt-exchange reaction may also be carried out directly after the process described above without the need for isolation of the compounds of the formula I whose cation is a proton which is stabilised by an organic base.

The said salt-exchange reaction enables the preparation of compounds of the formula I, as described above, in which the metal cation is an alkali-metal or alkaline-earth metal cation. Of particular interest are compounds of the formula I, as described above, having alkali-metal or alkaline-earth metal cations in which X denotes OR or Ac, in particular compounds of the formula I having alkali-metal or alkaline-earth metal cations in which R in the radical OR does not denote H, but instead has the other meanings, as described above.

In particular, lithium salts of the compounds of the formula I, abbreviated to formula I-1

Li⁺[P(R_(f))_(n)F_(5-n)X]⁻  I-1,

where R_(f) in each case, independently of one another, denotes a straight-chain or branched fluoroalkyl group having 1 to 8 C atoms, X denotes OR, Ac, OAr or OHet, Ac denotes a carboxyl group OC(O)R, also including salts of an aliphatic dicarboxylic acid having the formula Ib-1

2[Li]⁺[(R_(f))_(n)PF_(5-n)(OC(O)—R′—C(O)O)F_(5-n)P(R_(f))_(n)]²⁻  Ib-1

and R′ denotes a single bond or an alkylene group having 1 to 4 C atoms, Alk denotes a straight-chain or branched alkyl group having 1 to 12 C atoms, Ar denotes an aryl group having 6 to 12 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, Het denotes a heteroaryl group having 5 to 13 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, R denotes H, a straight-chain or branched alkyl group having 1 to 20 C atoms, which may be partially substituted by Hal, NH₂, NHAlk, NAlk₂, OH, NO₂, CN or SO₃H, or denotes a straight-chain or branched alkenyl group having 2 to 20 C atoms, which may contain a plurality of double bonds, where one or two non-adjacent carbon atoms of the alkyl or alkenyl group which are not bonded to the heteroatom may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, NH, —C(O)—, —O—C(O)— or —C(O)—O—, Hal denotes F, Cl, Br or I and n denotes 1, 2 or 3, and/or tautomers or stereoisomers thereof, including mixtures thereof in all ratios, are suitable for the preparation of electrolyte preparations, in particular for electrochemical or opto-electronic devices. The lithium salts of the formula I-1 are suitable, in particular, as conductive salt for electrochemical batteries, in particular lithium-ion batteries, lithium-ion capacitors or lithium batteries. Particular preference is given to the use of lithium salts of the formula I-1 in which R denotes a straight-chain or branched alkyl group having 1 to 20 C atoms, which may be partially substituted by Hal, NH₂, NHAlk, NAlk₂, OH, NO₂, CN or SO₃H, or denote a straight-chain or branched alkenyl group having 2 to 20 C atoms, which may contain a plurality of double bonds, where one or two non-adjacent carbon atoms of the alkyl or alkenyl group which are not bonded to the heteroatom may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, NH, —C(O)—, —O—C(O)— or —C(O)—O—.

Compounds of the formula I in which Kt^(z+) denotes an alkali-metal or alkaline-earth metal cation and X denotes OR and R denotes H can be stored at low temperatures, but decompose on heating and/or in the presence of water without or in the presence of a base. These compounds are formed alternatively to the process described above if an inorganic base, preferably an alkali-metal hydroxide, an alkaline-earth metal hydroxide and/or an alkali-metal carbonate or alkaline-earth metal carbonate, is reacted with the phosphorane of the formula II, as described above. This is independent of the reaction temperature used.

Compounds of the formula I in which Kt^(z+) denotes an alkali metal or an alkaline-earth metal cation and X denotes Ac are formed alternatively if an alkali-metal carboxylate or alkaline-earth metal carboxylate, as described above, is reacted with the phosphorane of the formula II, as described above, in the presence of an organic solvent.

Compounds of the formula I in which Kt^(z+) corresponds to an ammonium cation of the formula (1), as described above, and X denotes Ac or compounds of the formula Ib in which Kt^(z+) denotes an ammonium cation can alternatively be prepared by reacting a fluoroalkylfluorophosphorane of the formula II

(R_(f))_(n)PF_(5-n)  II,

where R_(f) in each case, independently of one another, denotes a straight-chain or branched fluoroalkyl group having 1 to 8 C atoms and n denotes 1, 2 or 3, with an ammonium carboxylate of the formula Va or Vb

[N(R⁰)₄]⁺[(OC(O)R)]⁻  Va or

2[N(R⁰)₄]⁺[(OC(O)—R′—C(O)O)]²⁻  Vb,

where R⁰, R and R′ have an above-described or preferred meaning, in an organic solvent and subsequently removing the solvent.

Compounds of the formula I in which Kt^(z+) corresponds to an ammonium cation of the formula (1) or a phosphonium cation of the formula (2), as described above, and X denotes OR and R denotes H can alternatively be prepared by reacting a fluoroalkylfluorophosphorane of the formula II

(R_(f))_(n)PF_(5-n)  II,

where R_(f) in each case, independently of one another, denotes a straight-chain or branched fluoroalkyl group having 1 to 8 C atoms and n denotes 1, 2 or 3, with an ammonium hydroxide of the formula VIa or a phosphonium hyroxide of the formula VIb

[N(R⁰)₄][OH]  VIa or

[P(R²)₄][OH]  VIb,

where R⁰ and R² have an above-mentioned or particularly preferred meaning, in an organic solvent and removing the organic solvent.

The compounds of the formula I, as described above, in which the cation Kt is a stabilised (solvated) proton, as described above, are particularly suitable as acid catalyst for chemical reactions, in particular for polymerisations and isomerisations.

The compounds of the formula I, as described above, in which Kt is a metal cation from groups 3 to 12 of the Periodic Table are particularly suitable as catalyst or as additive in electrolytes.

The compounds of the formula I, as described above, in which Kt is an organic cation, as described above or as preferably described, are particularly suitable as solvent or solvent additive, as catalyst or phase-transfer catalyst, as conductive salt or as electrolyte constituent, as fluorosurfactant, as heat-exchange medium, as separating agent or extractant, as antistatic, as plasticiser, as lubricant or constituent of lubricating oils or greases, as hydraulic fluid or additive for hydraulic fluids, as flameproofing agent or as additive in fire-extinguishing agents.

The compounds of the formula I having organic cations, as described above, are likewise ionic liquids.

In the case of the use of the compounds of the formula I as solvents, these are suitable in any type of reaction known to the person skilled in the art, for example for transition metal- or enzyme-catalysed reactions, such as, for example, hydroformylation reactions, oligomerisation reactions, esterifications or isomerisations, where the said list is not exhaustive.

In the case of the use as extractant, the compounds of the formula I can be employed to separate off reaction products, but also to separate off impurities, depending on the solubility of the respective component in the ionic liquid. In addition, the ionic liquids may also serve as separation media in the separation of a plurality of components, for example in the distillative separation of a plurality of components of a mixture.

Further possible applications are use as plasticiser in polymer materials, as flame retardant for a number of materials or applications, and as conductive salt or additive in various electrochemical cells and applications, for example in galvanic cells, in capacitors or in fuel cells.

Further areas of applications of the compounds of the formula I in accordance with this invention are solvents for carbohydrate-containing solids, in particular biopolymers and derivatives or degradation products thereof. In addition, these novel compounds can be used as lubricants, working media for machines, such as compressors, pumps or hydraulic devices. A further area of application is the field of particle or nanomaterial synthesis, where these ionic liquids can act as medium or additive.

The compounds of the formula I with organic cations, for example ionic liquids in accordance with this invention, can preferably be used in electrochemical and/or opto-electronic devices, in particular in electrolyte formulations.

The present invention therefore furthermore relates to an electrolyte formulation comprising at least one compound of the formula I as described or preferably described above.

Electrolyte formulations of compounds of the formula I in which [Kt]^(z+) denotes Li⁺ or an organic cation can preferably be used in primary batteries, secondary batteries, capacitors, supercapacitors or electrochemical cells, optionally also in combination with further conductive salts and/or additives, as constituent of a polymer electrolyte or phase-transfer medium. Preferred batteries are lithium batteries or lithium ion batteries. A preferred capacitor is a lithium ion capacitor. The corresponding preferred lithium compounds have been described above and apply correspondingly.

Electrolyte formulations of compounds of the formula I can preferably be used in electrochemical and/or optoelectronic devices, such as a photovoltaic cell, a light-emitting device, an electrochromic or photoelectrochromic device, an electrochemical sensor and/or biosensor, particularly preferably in a dye-sensitised solar cell.

Such electrolyte formulations represent a crucial part of the devices disclosed and the performance of the device is substantially dependent on the physical and chemical properties of the various components of these electrolytes.

Electrolyte formulations according to the invention represent alternatives to already known electrolyte formulations. In particular in the field of electrolyte formulations of dye-sensitised solar cells, they have increased power-conversion efficiency, in particular at low temperature. The advantage of the use of perfluoroalkylcyanomethoxyfluoroborate is its low viscosity and accordingly the lower Nernst diffusion resistance of the oxidant species, in particular at lower temperature.

WO 2007/093961 and WO 2009/083901 describe the best power-conversion efficiencies to date in ionic liquid-based electrolytes comprising a significant amount of organic salts with tetracyanoborate (TCB) anions.

In chemical terms, an electrolyte is any substance which contains free ions and is consequently electrically conductive. The most typical electrolyte is an ionic solution, but molten and solid electrolytes are likewise possible. An electrolyte formulation according to the invention is therefore an electrically conductive medium, principally due to the presence of at least one substance which is in dissolved and/or molten state, i.e. supports an electrical conductivity through the movement of ionic species.

Typical molarities of the compounds of the formula I, as described above, in the electrolyte formulations are in the range from 0.1 to 3.5 M, preferably in the range from 0.8 to 2.5 M.

The molarity is preferably achieved with at least one compound of the formula I in which [Kt]^(z+) denotes an organic cation as described or preferably described above.

For the purpose of the present invention, the molarity relates to the concentration at 25° C.

Other components of the electrolyte formulation are one or several further salts, solvents, iodine and others, as indicated below.

If the electrolyte formulation is a two-component system, it comprises two salts, one further salt and a compound of the formula I as described above. If the electrolyte formulation is a three-component system, it comprises two further salts and a compound of the formula I as described above. The two-component system comprises 90-20% by weight, preferably 80-55% by weight, particularly preferably 70-60% by weight of the further salt and 10-80% by weight, preferably 20-45% by weight or particularly preferably 30-40% by weight of the compound of the formula I as described above. The percentage data in this paragraph relate to the total amount (=100% by weight) of the salts present in the electrolyte formulation according to the invention. Amounts of further, generally optional components (additives) indicated below, such as, for example, N-containing compounds having free electron pairs, iodine, solvents, polymers, and nanoparticles, are not taken into account therein. The same percentage data apply to three-component or four-component systems, which means the total amount of the further salts must be used in the ranges indicated, for example two further ionic liquids are present, for example, in an amount of 90-20% by weight in the electrolyte formulation according to the invention.

According to a further embodiment of the present invention, the electrolyte formulation comprises at least one further salt with organic cations containing a quaternary nitrogen and an anion selected from a halide ion, such as F⁻, Cl⁻, I⁻, a polyhalide ion, a fluoroalkanesulfonate, a fluoroalkanecarboxylate, a tri(fluoroalkylsulfonyl)methide, a bis(fluoroalkylsulfonyl)imide, a nitrate, a hexafluorophosphate, a tris-, bis- or mono(fluoroalkyl)fluorophosphate, a tetrafluoroborate, a dicyanodifluoroborate, a tricyanofluoroborate, a tris-, bis- or mono(perfluoroalkyl)cyanoborate, a bis- or mono-cyanoperfluoroalkylmono- or bis fluoroborate, a perfluoroalkylalkoxyfluorocyanoborate or a perfluoroalkylalkoxydicyanoborate, a dicyanamide, a tricyanomethide, a tetracyanoborate, a thiocyanate, an alkylsulfonate or an alkylsulfate, where fluoroalkane has 1 to 20 C atoms, preferably perfluorinated, fluoroalkyl has 1 to 20 C atoms and alkyl has 1 to 20 C atoms. Fluoroalkane or fluoroalkyl is preferably perfluorinated.

The further salts are preferably selected from salts containing anions such as iodide, thiocyanate or tetracyanoborate, particularly preferred further salts are iodides.

The cation of the at least one further salt or of a preferred further salt can be selected from organic compounds containing a quaternary nitrogen atom, preferably cyclic organic cations, such as pyridinium, imidazolium, triazolium, pyrrolidinium or morpholinium.

However, in order to limit the amount of different cations in the electrolyte formulations, in particular for DSC, the organic cations can be selected from the definitions for the cations of the compounds of the formula I. According to a further preferred embodiment of the present invention, the electrolyte formulation therefore comprises at least one compound of the formula I as described above and at least one further iodide, in which the organic cations are selected, independently, from the group

in which the substituents R^(1′) to R^(4′) have a meaning as described or preferably described above.

Particularly preferred examples of the at least one further salt are 1-ethyl-3-methylimidazolium iodide, 1-(2-methoxyethyl)-3-methylimidazolium iodide, 1-propyl-3-methylimidazolium iodide, 1-butyl-3-methyl-imidazolium iodide, 1-hexyl-3-methylimidazolium iodide, 1,3-dimethyl-imidazolium iodide, 1-allyl-3-methylimidazolium iodide, N-butyl-N-methyl-pyrrolidinium iodide or N,N-dimethyl-pyrrolidinium iodide.

In a further embodiment of the invention, guanidinium thiocyanate can be added to the electrolyte formulation according to the invention.

The electrolyte formulation of the invention preferably comprises iodine (I₂). Preferably, it comprises 0.01 to 50% by weight, more preferably 0.1 to 20% by weight and most preferably 1 to 10% by weight of I₂.

In a preferred embodiment, the electrolyte formulation of the present invention furthermore comprises at least one compound containing a nitrogen atom having free electron pairs. Examples of such compounds are found in EP 0 986 079 A2, starting on page 2, line 40-55, and further from page 3, lines 14 to page 7, line 54, which are incorporated herein by way of reference. Preferred examples of compounds having free electron pairs include imidazole and derivatives thereof, in particular benzimidazole and derivatives thereof.

The electrolyte formulation of the present invention comprises less than 50% of an organic solvent. The electrolyte formulation preferably comprises less than 40%, particularly preferably less than 30%, still more preferably less than 20% and even less than 10%. The electrolyte formulation most preferably comprises less than 5% of an organic solvent. For example, it is essentially free from an organic solvent. Percentage data relate to % by weight.

Organic solvents, if present in the amounts indicated above, can be selected from those disclosed in the literature. The solvent, if present, preferably has a boiling point above 160 degrees Celsius, particularly preferably above 190 degrees, such as propylene carbonate, ethylene carbonate, butylene carbonate, γ-butyrolactone, γ-valerolactone, glutaronitrile, adiponitrile, N-methyloxazolidinone, N-methylpyrrolidinone, N,N′-dimethylimidazolidinone, N,N-dimethylacetamide, cyclic ureas, preferably 1,3-dimethyl-2-imidazolidinone or 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)pyrimidinone, tetraglyme, sulfolanes, sulfones, which are preferably asymmetrically substituted, for example 2-ethanesulfonylpropane, 1-ethanesulfonyl-2-methylpropane or 2-(propane-2-sulfonyl)-butane, 3-methylsulfolane, dimethyl sulfoxide, trimethyl phosphate and methoxy-substituted nitriles. Other possible solvents are acetonitrile, benzonitrile or valeronitrile.

If a solvent is present in the electrolyte formulation, a polymer may furthermore be present as gelling agent, where the polymer is polyvinylidene fluoride, polyvinylidene-hexafluoropropylene, polyvinylidene-hexafluoropropylene-chlorotrifluoroethylene copolymers, nafion, polyethylene oxide, polymethyl methacrylate, polyacrylonitrile, polypropylene, polystyrene, polybutadiene, polyethylene glycol, polyvinylpyrrolidone, polyaniline, polypyrrole, polythiophene. These polymers are added to electrolyte formulations in order to convert liquid electrolytes into quasi-solid or solid electrolytes and thus to improve the solvent retention, especially during ageing.

The electrolyte formulation of the invention may furthermore comprise metal-oxide nanoparticles, such as, for example, SiO₂, TiO₂, Al₂O₃, MgO or ZnO, which can also increase the solidity and thus the solvent retention.

The electrolyte formulation of the invention has many applications. For example, it can be used in an opto-electronic and/or electrochemical device, such as a photoelement, a light-emitter device, an electrochromic or photo-electrochromic device, an electrochemical sensor and/or biosensor. Use in electrochemical batteries is also possible, for example in a lithium ion battery or a double-layer capacitor.

The present invention therefore relates furthermore to the use of the electrolyte formulation as described in detail above in an electrochemical and/or opto-electronic device which is a photoelement, a light-emitter device, an electrochromic or photo-electrochromic device, an electrochemical sensor and/or biosensor. The electrolyte formulation can preferably be used in dye-sensitised solar cells.

The present invention therefore furthermore relates to an electrochemical and/or opto-electronic device, for example a photoelement, a light-emitter device, an electrochromic or photo-electrochromic device, an electrochemical sensor and/or biosensor comprising an electrolyte formulation comprising at least one compound of the formula I

Kt^(z+) z[P(R_(f))_(n)F_(5-n)X]⁻  I,

where R_(f) in each case, independently of one another, denotes a straight-chain or branched fluoroalkyl group having 1 to 8 C atoms, X denotes OR, Ac, OAr or OHet, Ac denotes a carboxyl group OC(O)R, also including salts of an aliphatic dicarboxylic acid having the formula Ib

x[Kt]^(z+) y[(R_(f))_(n)PF_(5-n)(OC(O)—R′—C(O)O)F_(5-n)P(R_(f))_(n)]²⁻  Ib,

where x denotes 2 and y denotes 1 if z denotes 1, x denotes 1 and y denotes 1 if z denotes 2, x denotes 2 and y denotes 3 if z denotes 3 and x denotes 1 and y denotes 2 if z denotes 4 and R′ denotes a single bond or an alkylene group having 1 to 4 C atoms, Ar denotes an aryl group having 6 to 12 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, Alk denotes a straight-chain or branched alkyl group having 1 to 12 C atoms, Het denotes a heteroaryl group having 5 to 13 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, R denotes H or a straight-chain or branched alkyl group having 1 to 20 C atoms, which may be partially substituted by Hal, NH₂, NHAlk, NAlk₂, OH, NO₂, CN or SO₃H, or denotes a straight-chain or branched alkenyl group having 2 to 20 C atoms, which may contain a plurality of double bonds, where one or two non-adjacent carbon atoms of the alkyl or alkenyl group which are not bonded to the heteroatom may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, NH, —C(O)—, —O—C(O)— or —C(O)—O— and Kt denotes a stabilised proton, a metal cation or an organic cation, Hal denotes F, Cl, Br or I, z denotes 1, 2, 3 or 4 and n denotes 1, 2 or 3, and/or tautomers or stereoisomers thereof, including mixtures thereof in all ratios or a preferred embodiment of a compound of the formula I of this type, as described above.

According to a preferred embodiment, the device of the invention is a dye or quantum dot solar cell, particularly preferably a dye solar cell.

Quantum dot solar cells are disclosed, for example, in U.S. Pat. No. 6,861,722. In dye solar cells, a dye is used in order to absorb the sunlight and convert it into electrical energy. There is no restriction per se regarding the type of dye so long as the LUMO value of the dye is slightly above the conduction band of the photoelectrode. Examples of dyes are disclosed in EP 0 986 079 A2, EP 1 180 774 A2 or EP 1 507 307 A1.

Preferred dyes are organic dyes, for example MK-1, MK-2 or MK-3 (the structure thereof is described in FIG. 1 of N. Koumura et al, J. Am. Chem. Soc. Vol 128, No. 44, 2006, 14256-14257), D102 (CAS No. 652145-28-3), D-149 (CAS No. 786643-20-7), D205 (CAS No. 936336-21-9), D358 (CAS No. 1207638-53-6), YD-2, as described in T. Bessho et al, Angew. Chem. Int. Ed. Vol 49, 37, 6646-6649, 2010, Y123 (CAS No. 1312465-92-1), bipyridineruthenium dyes, such as N3 (CAS No. 141460-19-7), N719 (CAS No. 207347-46-4), Z907 (CAS No. 502693-09-6), C101 (CAS No. 1048964-93-7), C106 (CAS No. 1152310-69-4), K19 (CAS No. 847665-45-6), SK-1 (CAS No. 906061-30-1), or terpyridineruthenium dyes, such as N749 (CAS No. 359415-47-7).

Particularly preferred dyes are the dyes Z907 or Z907Na, both of which are amphiphilic ruthenium sensitisers, or D205. The chemical name for Z907Na is NaRu(2,2′-bipyridine-4-carboxylic acid-4′-carboxylate)(4,4′-dinonyl-2,2′-bipyridine)(NCS)₂.

The structure of D205 is

Very particular preference is given to the use of the dyes Z907 or Z907Na.

A dye-sensitised solar cell comprises, for example, a photoelectrode, a counterelectrode and, between the photoelectrode and the counter-electrode, an electrolyte formulation or a charge-transport material, where a sensitising dye is absorbed on the surface of the photoelectrode facing the counterelectrode.

According to a preferred embodiment of the device according to the invention, it comprises a semiconductor, the electrolyte formulation as described above and a counterelectrode.

According to a preferred embodiment of the invention, the semiconductor is based on material selected from the group Si, TiO₂, SnO₂, Fe₂O₃, WO₃, ZnO, Nb₂O₅, CdS, ZnS, PbS, Bi₂S₃, CdSe, GaP, InP, GaAs, CdTe, CuInS₂, and/or CuInSe₂. The semiconductor preferably comprises a mesoporous surface, which increases the surface, which is optionally covered with a dye and is in contact with the electrolyte. The semiconductor is preferably located on a glass support or plastic film or metal foil. The support is preferably conductive.

The device of the present invention preferably comprises a counterelectrode. For example, fluorine-doped tin oxide or tin-doped indium oxide on glass (FTO- or ITO-glass, respectively) coated with Pt, carbon of preferably conductive allotropes, polyaniline or poly(3,4-ethylenedioxythiophene) (PEDOT). Metal substrates, such as stainless steel or titanium sheet, are possible substrates beside glass.

The device of the present invention can be produced, like the corresponding device of the prior art, by simply replacing the electrolyte with the electrolyte formulation of the present invention. In the case of dye-sensitised solar cells, for example, device assembly is disclosed in numerous patent specifications, for example WO 91/16719 (Examples 34 and 35), but also scientific literature, for example in Barbé, C. J., Arendse, F., Comte, P., Jirousek, M., Lenzmann, F., Shklover, V., Grätzel, M. J. Am. Ceram. Soc. 1997, 80, 3157; and Wang, P., Zakeeruddin, S. M., Comte, P., Charvet, R., Humphry-Baker, R., Grätzel, M. J. Phys. Chem. B 2003, 107, 14336.

The sensitised semiconducting material preferably serves as photoanode. The counterelectrode is preferably a cathode.

The present invention provides a process for the production of a photoelectric cell comprising the step of bringing the electrolyte formulation of the invention into contact with a surface of a semiconductor, where the surface is optionally coated with a sensitiser. The semiconductor is preferably selected from the materials given above, and the sensitiser is preferably selected from quantum dots and/or a dye as disclosed above, particularly preferably from a dye.

The electrolyte formulation can preferably simply be poured onto the semiconductor. It is preferably applied to the otherwise finished device, which already comprises a counterelectrode, by creating a vacuum in the internal lumen of the cell through a hole in the counterelectrode and adding the electrolyte formulation as disclosed in the reference from Wang et al., J. Phys. Chem. B 2003, 107, 14336.

The following working examples are intended to explain the invention without limiting it. The invention can be carried out correspondingly throughout the range claimed. Possible variants can also be derived starting from the examples. In particular, the features and conditions of the reactions described in the examples can also be applied to other reactions which are not shown in detail, but fall within the scope of protection of the claims.

EXAMPLES

The substances obtained are characterised by means of mass spectrometry, elemental analysis and NMR spectroscopy. NMR spectra are recorded using Avance III 300 spectrometers, from Bruker, Karlsruhe. Acetone-d6 is used in a capillary as lock substance. The referencing is carried out using external reference: TMS for ¹H and ¹³C spectra; CCl₃F— for ¹⁹F and 80% H₃PO₄— for ³¹P spectra.

Example 1 Preparation of [P(C₂F₅)₃F₂(dmap)]

2.8 g (22.9 mmol) of 4-(dimethylamino)pyridine are initially introduced in 100 ml of diethyl ether, and 12.2 g (28.6 mmol) of (C₂F₅)₃PF₂ are slowly added. After stirring for 15 minutes, volatile constituents are removed in vacuo, leaving a colourless solid.

Yield (based on DMAP): 12.1 g (97%). Melting point: 150-153° C.

³¹P-NMR spectroscopic data of [P(C₂F₅)₃F₂(dmap)] in Et₂O

δ, ppm Multiplicity J[Hz] Assignment −144.5 t, quin, t ¹J(PF) = 986 [P(C₂F₅)₃F₂(dmap)] ²J(PF_(cis)) = 107 ²J(PF_(trans)) = 97

¹⁹F-NMR spectroscopic data of [P(C₂F₅)₃F₂(dmap)] in Et₂O

δ, ppm Multiplicity J[Hz] Assignment Integral −80.4 m — trans-CF₃ 1 −81.6 m — cis-CF₃ 2 −99.4 d ¹J(PF) = 986 PF 0.6 −111.5 m (br) — cis-CF₂ 1 −115.3 d, m ²J(PF) = 95 trans-CF₂ 0.6

¹H-NMR spectroscopic data of [P(C₂F₅)₃F₂(dmap)] in CDCl₃

δ, ppm Multiplicity J[Hz] Assignment Integral 3.2 s — —N(CH₃)₂ 3 6.7 d ³J(HH) = 7 H2 1 8.4 m (br) — H1 1

¹³C-NMR spectroscopic data of [P(C₂F₅)₃F₂(dmap)] in CDCl₃

δ, ppm Multiplicity J[Hz] Assignment  38.6 ^(a) s — —N(CH₃)₂ 105.9 ^(a) s — C1 116.7 ^(b) m — —CF₂CF₃ 118.2 ^(b) m — —CF₂CF₃ 138.9 ^(a) s — C2 156.1 ^(a) s — C3 ^(a) {¹H} ^(b) {¹⁹F}

Elemental analysis data of [P(C₂F₅)₃F₂(dmap)]

N C H calculated 5.11 28.48 1.84 experimental 4.91 28.63 1.67

Mass spectrometric data (El, 20 eV)

m/e Rel. intensity [%] Assignment 407 12 [P(C₂F₅)₃F(dmap)]⁺ 307 50 [P(C₂F₅)₂F₂(dmap)]⁺ 207 15 [P(C₂F₅)F₃(dmap)]⁺ 122 100 [C₇H₁₀N₂]⁺ 69 6 [CF₃]⁺

Example 2 Preparation of [PPh₄][P(C₂F₅)₃F₂OH]

0.96 g (1.75 mmol) of [P(C₂F₅)₃F₂(dmap)] are initially introduced in ether, and excess water is added. After stirring for 30 minutes, 0.66 g (1.75 mmol) of [PPh₄]Cl, dissolved in 2 ml of water, are added, and the mixture is again stirred for 20 minutes. The aqueous phase is subsequently separated off, and the organic phase is extracted three times with water. The organic phase is dried in vacuo, leaving a colourless solid as residue. Yield (based on [P(C₂F₅)₃F₂(dmap)]: 1.29 g (94%). Melting point: 139° C.

³¹P-NMR spectroscopic data of [PPh₄][P(C₂F₅)₃F₂OH] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral 23.2 s — [PPh₄][P(C₂F₅)₃F₂OH] 1 −148.3 t, sept ¹J(PF) = 845 [PPh₄][P(C₂F₅)₃F₂OH] ²J(PF) = 86

¹⁹F-NMR spectroscopic data of [PPh₄][P(C₂F₅)₃F₂OH] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral −80.1 m — trans-CF₃ 1 −81.2 m — cis-CF₃ 2.2 −86.6 d, m ¹J(PF) = 846 PF 0.3 −114.1 d ²J(PF) = 86 cis-, trans-CF₂ 2.5

¹H-NMR spectroscopic data of [PPh₄][P(C₂F₅)₃F₂OH] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral 5.1 t, d ³J(FH) = 14 [P(C₂F₅)₃F₂OH]⁻ 1 ²J(PH) = 3 7.8-8.1 m — [PPh₄]⁺ 22

¹³C-NMR spectroscopic data of [PPh₄][P(C₂F₅)₃F₂OH] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment 118.5 ^(a) d ¹J(PC) = 90 C1 119.1 ^(b) m — —CF₂CF₃ 120.7 ^(b) m — —CF₂CF₃ 130.3 ^(a) d ²J(PC) = 13 C2 134.7 ^(a) d ³J(PC) = 10 C3 135.4 ^(a) d ⁴J(PC) = 3 C4 ^(a) {¹H} ^(b) {¹⁹F}

Elemental analysis data of [PPh₄][P(C₂F₅)₃F₂OH]

C H calculated 46.05 2.71 experimental 46.40 2.79

Mass spectrometric data (ESI, negative scan mode)

Signal Rel. intensity [%] Assignment 443.18 100 [P(C₂F₅)₃F₂OH]⁻ 323.15 41 [P(C₂F₅)₂F₂O]⁻

Example 3 Preparation of [HDMAP][P(C₂F₅)₃F₂OC(O)CH₃]

0.52 g (0.96 mmol) of [P(C₂F₅)₃F₂(dmap)] are initially introduced in dichloromethane. 0.19 g (3.17 mmol) of acetic acid are added at room temperature, and the reaction mixture is stirred for 3 hours. Volatile constituents are subsequently removed in vacuo, leaving a colourless solid. Yield (based on [P(C₂F₅)₃F₂(dmap)]): 0.54 g (93%)

³¹P-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OC(O)CH₃] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment −146.3 t, quin, t ¹J(PF) = 915 [P(C₂F₅)₃F₂OC(O)CH₃]⁻ ²J(PF_(cis)) = 103 ²J(PF_(trans)) = 84

¹⁹F-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OC(O)CH₃] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral −80.2 m — trans-CF₃ 1 −81.8 m — cis-CF₃ 2 −86.9 d, m ¹J(PF) = 923 PF 0.6 −115.3 d, m ²J(PF) = 85 trans-CF₂ — −116.0 d, m ²J(PF) = 103 cis-CF₂ —

¹H-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OC(O)CH₃] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral 1.9 s — —OC(O)CH₃ 1.6 3.2 s — —N(CH₃)₂ 3 6.9 d ³J(HH) = 7 H1 1 7.9 d ³J(HH) = 7 H2 1

¹³C-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OC(O)CH₃] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment  23.3 ^(a) s — —OC(O)CH₃  39.6 ^(a) s — —N(CH₃)₂ 107.1 ^(a) s — C1 116.7 ^(b) m — —CF₂CF₃ 120.0 ^(b) m — —CF₂CF₃ 138.6 ^(a) s — C2 157.7 ^(a) s — C3 166.3 ^(a) d ²J(PC) = 18 —OC(O)CH₃ ^(a) {¹H} ^(b) {¹⁹F}

Example 4 Preparation of [HDMAP][P(C₂F₅)₃F₂OPh]

0.52 g (0.95 mmol) of [P(C₂F₅)₃F₂(dmap)] are initially introduced in diethyl ether. 0.13 g (1.34 mmol) of phenol are added at room temperature, and the reaction mixture is stirred for 12 hours. Two phases form. The solvent is removed in vacuo, leaving a clear, colourless liquid.

³¹P-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OPh] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment −147.5 t, quin, t ¹J(PF) = 893 [P(C₂F₅)₃F₂OPh]⁻ ²J(PF_(cis)) = 98 ²J(PF_(trans)) = 84

¹⁹F-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OPh] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral −79.4 m — trans-CF₃ — −80.5 m — cis-CF₃ — −85.5 d, m ¹J(PF) = 896 PF — −111.5 d, m ²J(PF) = 97 cis-CF₂ — −112.7 d, m ²J(PF) = 79 trans-CF₂ —

¹H-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OPh] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral 3.4 s — —N(CH₃)₂ 3 6.7 d ³J(HH) = 7 H1 1 7.1 m — —OC₆H₅ 2.2 8.3 d ³J(HH) = 7 H2 1

¹³C-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OPh] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment  39.7 ^(a) s — —N(CH₃)₂ 106.9 ^(a) s — C1 115.2 ^(a) s — C5 118.1 ^(b) m — —CF₂CF₃ 119.7 ^(b) m — —CF₂CF₃ 120.4 ^(a) s — C6/7 128.9 ^(a) s — C6/7 138.8 ^(a) s — C2 157.0 ^(a) s — C4 157.6 ^(a) s — C3 ^(a) {¹H} ^(b) {¹⁹F}

Example 5 Preparation of [HDMAP]₂[{P(C₂F₅)₃F₂O}₂C₆H₄]

1.11 g (2 mmol) of [P(C₂F₅)₃F₂(dmap)] are initially introduced in diethyl ether. 0.11 g (1 mmol) of hydroquinone are added at room temperature, and the reaction mixture is stirred for 4 hours. Volatile constituents are subsequently removed in vacuo, leaving a colourless solid. Yield (based on hydroquinone): 0.85 g (78%).

³¹P-NMR spectroscopic data of [HDMAP]₂[{P(C₂F₅)₃F₂O}₂C₆H₄] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment −148.0 t, quin, t ¹J(PF) = 882 [{P(C₂F₅)₃F₂O}₂C₆H₄]²⁻ ²J(PF_(cis)) = 96 ²J(PF_(trans)) = 78

¹⁹F-NMR spectroscopic data of [HDMAP]₂[{P(C₂F₅)₃F₂O}₂C₆H₄] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral −80.4 m — trans-CF₃ 1 −81.6 m — cis-CF₃ 2 −86.9 d, m ¹J(PF) = 881 PF 0.6 −112.9 d, m ²J(PF) = 98 cis-CF₂ 1.3 −113.9 d, m ²J(PF) = 80 trans-CF₂ 0.7

¹H-NMR spectroscopic data of [HDMAP]₂[{P(C₂F₅)₃F₂O}₂C₆H₄] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral 3.1 s — —N(CH₃)₂ 3 6.8 m — H5/6 0.5 6.8 d ³J(HH) = 8 H1 1 7.9 d ³J(HH) = 8 H2 1

Elemental analysis data of [HDMAP]₂[{P(C₂F₅)₃F₂O}₂C₆H₄]

N C H calculated 4.67 32.07 1.51 experimental 4.73 32.40 2.26

Example 6 Preparation of [HDMAP][P(C₂F₅)₃F₂OEt]

10.6 g (230 mmol) of ethanol are initially introduced in 100 ml of Et₂O. 12.5 g (23 mmol) of [P(C₂F₅)₃F₂(dmap)] are added at room temperature, and the mixture is stirred for 30 minutes. Volatile substances are subsequently removed overnight in vacuo, leaving a colourless solid. Yield (based on [P(C₂F₅)₃F₂(dmap)]): 13.6 g (100%). Melting point: 75-78° C.

³¹P-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OEt] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment −149.4 t, sept ¹J(PF) = 869 [P(C₂F₅)₃F₂OC₂H₅]⁻ ²J(PF) = 88

¹⁹F-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OEt] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral −80.6 m — trans-CF₃ 1 −81.8 m — cis-CF₃ 2 −94.5 d ¹J(PF) = 869 PF 0.6 −113.5 d, m ²J(PF) = 83 trans-CF₂ 0.6 −114.4 d, m ²J(PF) = 86 cis-CF₂ 1.3

¹H-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OEt] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral 1.1 t, d ³J(HH) = 7 —OCH₂CH₃ 1.4 ⁴J(PH) = 1 3.2 s — —N(CH₃)₂ 3 4.0 pseudo- ³J(PH) = 7 —OCH₂CH₃ 0.9 quin ³J(HH) = 7 5.3 s — —NH⁺ 1 6.8 d ³J(HH) = 7 H1 1 8.0 d ³J(HH) = 7 H2 1

¹³C-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OEt] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment  16.0 ^(a) d ³J(CP) = 10 —OCH₂CH₃  39.6 ^(a) s — (CH₃)₂N—  61.8 ^(a) m — —OCH₂CH₃ 107.1 ^(a) s — C1 118.8 ^(b) m — —CF₂CF₃ 122.5 ^(b) m — —CF₂CF₃ 138.5 ^(a) s — C2 157.9 ^(a) s — C3 ^(a) {¹H} ^(b) {¹⁹F}

Elemental analysis data of [HDMAP][P(C₂F₅)₃F₂OEt]

N C H calculated 4.71 30.32 2.71 experimental 4.74 30.32 2.69

Mass spectrometric data (ESI, negative scan mode)

Signal Rel. intensity [%] Assignment 965.04 9 — 471.16 100 [P(C₂F₅)₃F₂OC₂H₅]⁻ 445.11 21 [P(C₂F₅)₃F₃]⁻

Example 7 Preparation of [HDMAP][P(C₂F₅)₃F₂OCH₂CF₃]

2.5 g (4.5 mmol) of [P(C₂F₅)₃F₂(dmap)] are initially introduced in diethyl ether. 0.9 g (9.0 mmol) of trifluoroethanol are added at room temperature, and the reaction mixture is stirred for 12 hours. Volatile constituents are subsequently removed in vacuo, leaving a colourless solid. Yield (based on [P(C₂F₅)₃F₂(dmap)]): 2.8 g (95%). Melting point: 91-93° C.

³¹P-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OCH₂CF₃] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment −149.9 t, sept ¹J(PF) = 886 [P(C₂F₅)₃F₂OCH₂CF₃]⁻ ²J(PF) = 88

¹⁹F-NMR spectroscopic data of [HDMAP][(C₂F₅)₃PF₂OCH₂CF₃] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral −75.4 s — [P(C₂F₅)₃F₂OCH₂CF₃]⁻ 1 −79.6 m — trans-CF₃ 1 −80.8 m — cis-CF₃ 2 −93.8 d, m ¹J(PF) = 883 PF 0.5 −112.2 d, m — trans-, cis-CF₃ 2.2

¹H-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OCH₂CF₃] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral 3.2 s — —N(CH₃)₂ 3 4.4 quar, d ³J(FH) = 9 —OCH₂CF₃ 1 ³J(PH) = 4 6.8 d ³J(HH) = 7 H1 1 8.0 d — H2 1

¹³C-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OCH₂CF₃] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment  39.6 ^(a) s — —N(CH₃)₂  64.1 ^(a) m — —OCH₂CF₃ 106.9 ^(a) s — C1 118.8 ^(b) m — —CF₂CF₃ 120.4 ^(b) m — —CF₂CF₃ 124.5 ^(b) m — —OCH₂CF₃ 138.9 ^(a) s — C2 157.7 ^(a) s — C3 ^(a) {¹H} ^(b) {¹⁹F}

Elemental analysis data of [HDMAP][P(C₂F₅)₃F₂OCH₂CF₃]

N C H calculated 4.32 27.79 2.02 experimental 4.47 28.10 1.64

Mass spectrometric data (ESI, negative scan mode)

Signal Rel. intensity [%] Assignment 1088.97 13 — 525.15 100 [P(C₂F₅)₃F₂OCH₂CF₃]⁻

Example 8 Preparation of [HDMAP][P(C₂F₅)₃F₂ODec]

0.69 g (1.25 mmol) of [P(C₂F₅)₃F₂(dmap)] are dissolved in Et₂O. 0.20 g (1.25 mmol) of 9-decen-1-ol are added at room temperature, and the mixture is stirred for 1.5 hours. The reaction mixture is subsequently dried in vacuo, leaving a clear viscous liquid. Yield (based on [P(C₂F₅)₃F₂(dmap)]): 0.88 g (99%). Melting point: <20° C.

³¹P-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂ODec] in CDCl₃

δ, ppm Multiplicity J[Hz] Assignment −147.2 t, sept ¹J(PF) = 873 [P(C₂F₅)₃F₂OC₁₀H₁₉]⁻ ²J(PF) = 88

¹⁹F-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂ODec] in CDCl₃

δ, ppm Multiplicity J[Hz] Assignment Integral −79.7 m — trans-CF₃ 1 −81.0 m — cis-CF₃ 2.1 −94.9 d, m ¹J(PF) = 876 PF 0.5 −113.0 d, m — cis-, trans-CF₂ 2.1

¹H-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂ODec] in CDCl₃

δ, ppm Multiplicity J[Hz] Assignment Integral 1.2-1.6 m — H6-H10 5.7 1.5 t ³J(HH) = 7 H5 — 2.0 quin ³J(HH) = 7 H11 1 3.2 s — —N(CH₃)₂ 3 3.7 t ³J(HH) = 7 H4 0.6 4.9-5.0 m — H13 0.9 5.8 m — H12 0.5 6.7 d ³J(HH) = 7 H1 1 7.8 d ³J(HH) = 7 H2 1

¹³C{¹H}-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂ODec] in CDCl₃

δ, ppm Multiplicity J[Hz] Assignment 25.7; 28.9; s — C6-C10 29.0; 29.3; 29.4 32.8 s — C5 33.8 s — C11 40.0 s — —N(CH₃)₂ 63.2 s — C4 107.0 s — C1 114.1 s — C13 138.5 s — C2 139.3 s — C12 157.4 s — C3

Example 9 Preparation of [BMMIM][P(C₂F₅)₃F₂OEt]

5.3 g (9 mmol) of [HDMAP][P(C₂F₅)₃F₂OEt] are dissolved in 50 ml of dichloromethane, and 1.7 g (9 mmol) of 1-butyl-2,3-dimethylimidazolium chloride, dissolved in 5 ml of dichloromethane, are added. The reaction mixture is stirred at room temperature for 1.5 hours and subsequently extracted three times with water. Volatile constituents of the organic phase are removed in vacuo, leaving a colourless liquid. Yield (based on 1-butyl-2,3-dimethylimidazolium chloride): 4.9 g (87%).

Analytical data of [BuDIm][P(C₂F₅)₃F₂OEt]

Glass transition [° C.] −57 Decomposition [° C.] 120 H₂O content [ppm] 13.1 Cl⁻ content [ppm] 87.5 F⁻ content [ppm] 1202

³¹P-NMR spectroscopic data of [BuDIm][P(C₂F₅)₃F₂OEt] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment −149.5 t, sept ¹J(PF) = 866 [P(C₂F₅)₃F₂OEt]⁻ ²J(PF) = 84

¹⁹F-NMR spectroscopic data of [BuDIm][P(C₂F₅)₃F₂OEt] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral −80.1 m — trans-CF₃ 3 −81.3 m — cis-CF₃ 6 −93.9 d, m ¹J(PF) = 870 PF 2 −113.3 d, m ²J(PF) = 84 trans-CF₂ 2 −116.9 d, m ²J(PF) = 86 cis-CF₂ 4

¹H-NMR spectroscopic data of [BuDIm][P(C₂F₅)₃F₂OEt] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral 0.9 t ³J(HH) = 7 H9/H13 3 1.0 t ³J(HH) = 7 H13/H9 3 1.3 sext ³J(HH) = 8 H8 2 1.7 quin ³J(HH) = 7 H7 2 2.5 s — H11 3 3.7 s — H10 3 3.9 m — H6, H12 4 7.2 m — H4, H5 2

¹³C{¹H}-NMR spectroscopic data of [BuDIm][P(C₂F₅)₃F₂OEt] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment 9.0 s — C11 12.7 s — C9 16.0 s — C13 19.1 s — C8 31.2 s — C7 34.7 s — C10 48.0 s — C6 61.8 s — C12 120.8 s — C4/5 122.2 s — C4/5 144.3 s — C2

Example 10 Preparation of [BMMIM][P(C₂F₅)₃F₂OCH₂CF₃]

4.7 g (7.3 mmol) of [HDMAP][P(C₂F₅)₃F₂OCH₂CF₃] are dissolved in 50 ml of dichloromethane, and 1.4 g (7.4 mmol) of 1-butyl-2,3-dimethylimidazolium chloride, dissolved in 3 ml of dichloromethane, are added. The reaction mixture is stirred at room temperature for 1 hour and subsequently extracted three times with water. Volatile constituents of the organic phase are removed in vacuo, leaving a colourless liquid. Yield (based on 1-butyl-2,3-dimethylimidazolium chloride): 4.5 g (91%)

TABLE Analytical data of [BuDIm][P(C₂F₅)₃F₂OCH₂CF₃] Glass transition [° C.] −58 Decomposition [° C.] 212 H₂O content [ppm] 24.4 Cl⁻ content [ppm] <5 F⁻ content [ppm] 74

³¹P-NMR spectroscopic data of [BuDIm][P(C₂F₅)₃F₂OCH₂CF₃] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment −149.9 t, sept ¹J(PF) = 885 [P(C₂F₅)₃F₂OCH₂CF₃]⁻ ²J(PF) = 85

¹⁹F-NMR spectroscopic data of [BuDIm][P(C₂F₅)₃F₂OCH₂CF₃] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral −75.9 s — —OCH₂CF₃ 3 −80.3 m — trans-CF₃ 3 −81.7 m — cis-CF₃ 6 −94.5 d, m ¹J(PF) = 884 PF 2 −113.4 m — cis-, trans-CF₂ 6

¹H-NMR spectroscopic data of [BuDIm][P(C₂F₅)₃F₂OCH₂CF₃] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment Integral 0.9 t ³J(HH) = 7 H9 3 1.3 sext ³J(HH) = 8 H8 2 1.7 quin ³J(HH) = 7 H7 2 2.5 s — H11 3 3.7 s — H10 3 4.0 t ³J(HH) = 7 H6 2 4.4 m — H12 2 7.2 m — H4, H5 2

¹³C{1H}-NMR spectroscopic data of [BuDIm][P(C₂F₅)₃F₂OCH₂CF₃] in CD₃CN

δ, ppm Multiplicity J[Hz] Assignment 9.0 s — C11 12.7 s — C9 19.1 s — C8 31.2 s — C7 34.7 s — C10 48.0 s — C6 64.2 m — C12 120.8 s — C4/5 122.3 s — C4/5 124.5 m — C13 144.8 s — C2

Example 11 Preparation of [HDMAP][P(C₂F₅)₃F₂OC₂H₄OH]

0.60 g (1.1 mmol) of [P(C₂F₅)₃F₂(dmap)] are initially introduced in diethyl ether. 0.10 g (1.6 mmol) of ethylene glycol are added at room temperature, and the reaction mixture is stirred for 24 hours. Volatile constituents are subsequently removed in vacuo, leaving a colourless solid. Yield (based on [P(C₂F₅)₃F₂(dmap)]): 0.61 g (89%). Melting point: 88° C. (softening of the sample), 91° C. decomposition.

³¹P-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OC₂H₄OH]

δ, ppm Multiplicity J[Hz] Assignment −149.2 t, sept ¹J(PF) = 871 [P(C₂F₅)₃F₂OC₂H₄OH]⁻ ²J(PF) = 86

¹⁹F-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OC₂H₄OH]

δ, ppm Multiplicity J[Hz] Assignment Integral −79.3 m — trans-CF₃ 1 −80.4 m — cis-CF₃ 1.8 −93.2 d, m ¹J(PF) = 873 PF 0.3 −112.6 d, m ²J(PF) = 83 trans-, cis-CF₂ 1.8

¹H-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OC₂H₄OH]

δ, ppm Multiplicity J[Hz] Assignment Integral 3.2 s — N(CH₃)₂ 3 3.5 t ³J(HH) = 4 H5 0.8 4.0 pseudo-quar ³J(HH) = 4 H4 0.6 ³J(PH) = 4 6.8 d ³J(HH) = 8 H1 1 8.0 d ³J(HH) = 8 H2 1

¹³C-NMR spectroscopic data of [HDMAP][P(C₂F₅)₃F₂OC₂H₄OH]

δ, ppm Multiplicity J[Hz] Assignment  39.6 ^(a) s — —N(CH₃)₂  62.1 ^(a) d ²J(PC) = 9 C4  67.8 ^(a) s — C5 106.8 ^(a) s — Cl 116.7 ^(b) m — —CF₂CF₃ 120.6 ^(b) m — —CF₂CF₃ 138.6 ^(a) s — C2 157.6 ^(a) s — C3 ^(a) {¹H} ^(b) {¹⁹F}

Elemental analysis data of [HDMAP][P(C₂F₅)₃F₂OC₂H₄OH]

N C H calculated 4.59 29.52 2.64 experimental 4.62 29.54 2.28

Example 12 Preparation of [P(C₂F₅)₃F₂(dmf)]

0.12 g (1.7 mmol) of DMF are initially introduced in about 15 ml of diethyl ether, and 1.02 g (2.4 mmol) of (C₂F₅)₃PF₂ are added. The reaction mixture is stirred at room temperature for 45 minutes. The solvent and excess (C₂F₅)₃PF₂ are subsequently removed in vacuo, leaving a colourless solid. Yield (based on DMF): 0.84 g (99%).

³¹P-NMR spectroscopic data of [P(C₂F₅)₃F₂(dmf)] in DMF

δ, ppm Multiplicity J[Hz] Assignment −142.1 t, t, quin ¹J(PF) = 960 [P(C₂F₅)₃F₂(dmf)] ²J(PF_(trans)) = 87 ²J(PF_(cis)) = 103

¹⁹F-NMR spectroscopic data of [P(C₂F₅)₃F₂(dmf)] in DMF

δ, ppm Multiplicity J[Hz] Assignment Integral −81.4 m   trans-CF₃ 1 −82.4 m   cis-CF₃ 2 −92.6 d, m (br) ¹J(PF) = 947 PF 0. 3 −113.8 m (br)   cis-CF₂ 1 −116.4 d ²J(PF ) = 88 trans-CF₂ 0. 6

¹H-NMR spectroscopic data of [P(C₂F₅)₃F₂(dmf)] in DMF

δ, ppm Multiplicity J[Hz] Assignment Integral 2.7 s — CH₃ (a) 1 3.1 s — CH₃ (b) 0.9 8.4 s — [P(C₂F₅)₃F₂(OCHNMe₂)] 0.3

¹³C-NMR spectroscopic data of [P(C₂F₅)₃F₂(dmf)] in DMF

δ, ppm Multiplicity J[Hz] Assignment  34.6 ^(a) (hidden) — CH₃ (a)  39.8 ^(a) quar ¹J(CH) = 143 CH₃ (b) 117.0 ^(b) d, m ¹J(CP) = 249 —CF₂CF₃ 119.0 ^(b) d, m ²J(CP) = 30 —CF₂CF₃ 163.2 ^(a) d ¹J(CH) = 218 [P(C₂F₅)₃F₂(OCHNMe₂)] ^(a) {¹H} ^(b) {¹⁹F}

Example 13 Reaction of [P(C₂F₅)₃F₂(dmf)] with H₂O

A few drops of water are added to [P(C₂F₅)₃F₂(dmf)] in DMF. The reaction solution is investigated by NMR spectroscopy.

³¹P-NMR spectroscopic data of [H(dmf)_(n)][P(C₂F₅)₃F₂OH] in acetone-d₆

δ, ppm Multiplicity J[Hz] Assignment −147.9 t, sept ¹J(PF) = 847 [H(dmf)_(n)][P(C₂F₅)₃F₂OH] ²J(PF) = 86

¹⁹F-NMR spectroscopic data of [H(dmf)_(n)][P(C₂F₅)₃F₂OH] in acetone-d₆

δ, ppm Multiplicity J[Hz] Assignment Integral −80.5 m — trans-CF₃ 1 −81.5 m — cis-CF₃ 1.9 −87.0 d, m ¹J(PF) = 839 PF 0.6 −114.5 d ²J(PF) = 85 cis-, trans-CF₂ 1.9

¹H-NMR spectroscopic data of [H(dmf)_(n)][P(C₂F₅)₃F₂OH] in acetone-d₆

δ, ppm Multiplicity J[Hz] Assignment Integral 2.7 s — CH₃ (a) 1.1 3.0 s — CH₃ (b) 1 8.8 s — [H(OHCNMe₂)_(n)] —

Example 14 Reaction of [P(C₂F₅)₃F₂(dmf)] with EtOH

A few drops of ethanol are added to [P(C₂F₅)₃F₂(dmf)] in DMF. The reaction solution is investigated by NMR spectroscopy.

³¹P-NMR spectroscopic data of [H(dmf)_(n)][P(C₂F₅)₃F₂OEt] in DMF

δ, ppm Multiplicity J[Hz] Assignment −148.6 t, pseudo-sept ¹J(PF) = 871 [H(dmf)_(n)][P(C₂F₅)₃F₂OEt]

¹⁹F-NMR spectroscopic data of [H(dmf)_(n)][P(C₂F₅)₃F₂OEt] in DMF

δ, ppm Multiplicity J[Hz] Assignment Integral −79.2 m — trans-CF₃ 1 −80.5 m — cis-CF₃ 1.9 −93.1 d, m ¹J(PF) = 871 PF 0.6 −112.3 d, m ²J(PF) = 83 trans-CF₂ — −113.1 d, m ²J(PF) = 86 cis-CF₂ —

Example 15 Reaction of (C₄F₉)₃PF₂ with DMF

(C₄F₉)₃PF₂ is added to excess DMF. The reaction solution is investigated by NMR spectroscopy.

³¹P-NMR spectroscopic data of [P(C₄F₉)₃F₂(dmf)] in DMF

δ, ppm Multiplicity J[Hz] Assignment −135.5 t, m ¹J(PF) = 999 [P(C₄F₉)₃F₂(dmf)] ²J(PF) = 102

¹⁹F-NMR spectroscopic data of [P(C₄F₉)₃F₂(dmf)] in DMF^(a)

δ, ppm Multiplicity J[Hz] Assignment Integral −82.1 s — CF₃ — −108.1 m — CF₂ — −126.2 ^(a) The resonance of the fluorine atoms bonded to the phosphorus atom is covered by other resonances.

¹H-NMR spectroscopic data of [P(C₄F₉)₃F₂(dmf)] in DMF

δ, ppm Multiplicity J[Hz] Assignment Integral 2.7 s — CH₃ (a) 0.9 3.1 s — CH₃ (b) 1 8.4 s — [P(C₂F₉)₃F₂(OCHNMe₂)] 0.3

Example 16 Reaction of [P(C₄F₉)₃F₂(dmf)] with EtOH

A few drops of ethanol are added to [P(C₄F₉)₃F₂(dmf)] in DMF. The reaction mixture is investigated by NMR spectroscopy.

³¹P-NMR spectroscopic data of [H(dmf)_(n)][P(C₄F₉)₃F₂OEt] in DMF

δ, ppm Multiplicity J[Hz] Assignment −143.3 t, m ¹J(PF) = 903 [H(dmf)_(n)][P(C₄F₉)₃F₂OEt] ²J(PF) = 88

¹⁹F-NMR spectroscopic data of H[P(C₄F₉)₃F₂OEt].nDMF in DMF

δ, ppm Multiplicity J[Hz] Assignment Integral −82.3 m — CF₃ — −92.3 d, m ¹J(PF) = 899 PF — −109.6 m — CF₂ — −127.6

Example 17 Preparation of [P(C₂F₅)₂F₃(dmf)]

0.09 g (1.2 mmol) of DMF are initially introduced in about 15 ml of diethyl ether, and 1.5 mmol of (C₂F₅)₂PF₃ are condensed on. The reaction mixture is investigated by NMR spectroscopy. Two conformers, IIb and Ib, form on slow thawing. IIb is converted into Ib within a few hours at room temperature. After stirring at room temperature for 30 minutes, the solvent is removed in vacuo, leaving a colourless solid. Yield (based on DMF): 0.47 g (97%).

³¹P-NMR spectroscopic data of the two conformers of [P(C₂F₅)₂F₃(dmf)] in DMF

δ, ppm Multiplicity J[Hz] Assignment −146.6 d, t, quin, d ¹J(PF_(A)) = 847 [P(C₂F₅)₂F₃(dmf)] (IIb) ¹J(PF_(B)) = 922 ²J(PF) = 95 ³J(PH) = 7 −148.7 d, t, quin ¹J(PF_(A)) = 947 [P(C₂F₅)₂F₃(dmf)] (Ib) ¹J(PF_(B)) = 986 ²J(PF) = 108

¹⁹F-NMR spectroscopic data of the two conformers of [P(C₂F₅)₂F₃(dmf)] in DMF

δ, ppm Multiplicity J[Hz] Assignment Integral −58.7 d, m ¹J(PF_(A)) = 848 PF_(A) (IIb) 0.3 −69.1 d, m ¹J(PF_(A)) = 948 PF_(A) (Ib) 0.8 −74.9 d, d, m ¹J(PF_(B)) = 987 PF_(B) (Ib) 1.7 ²J(F_(B)F_(A)) = 45 −76.2 d, d, m ¹J(PF_(B)) = 922 PF_(B) (IIb) 0.7 ²J(F_(B)F_(A)) = 46 −82.7 m — CF₃ (IIb) 1.0 −83.4 m — CF₃ (IIb)/CF₃ (Ib) 6.2 −117.5 d, m ²J(PF) = 95 CF₂ (IIb) 0.6 −118.7 d, d, t, m ²J(PF) = 108 CF₂ (Ib) 3.4 ³J(FF_(A)) = 10 ³J(FF_(B)) = 11 −119.5 d, m ²J(PF) = 93 CF₂ (IIb) 0.6

¹H-NMR spectroscopic data of the two conformers of [P(C₂F₅)₂F₃(dmf)] in DMF

δ, ppm Multiplicity J[Hz] Assignment Integral 2.1 s — CH₃ (a) (IIb) 0.3 2.1 s — CH₃ (a) (Ib) 1 2.4 s — CH₃ (b) (IIb) 0.2 2.5 s — CH₃ (b) (Ib) 1 7.8 s — [P(C₂F₅)₂F₃(OCHNMe₂)] (Ib) 0.3 10.5 s (br) — [P(C₂F₅)₂F₃(OCHNMe₂)] (IIb) —

¹³C-NMR spectroscopic data of the two conformers of [P(C₂F₅)₂F₃(dmf)] in DMF

δ, ppm Multiplicity J[Hz] Assignment  35.0 ^(a) (hidden) — CH₃ (a) (Ib)  40.0 ^(a) quar ¹J(CH) = 144 CH₃ (b) (Ib) 115.5 ^(b) d, m ¹J(CP) = 329 −CF₂CF₃ 119.4 ^(b) d, m ²J(CP) = 32 −CF₂CF₃ 163.4 ^(a) d, t ¹J(CH) = 214 [P(C₂F₅)₂F₃(OCHNMe₂)] (Ib) ^(a) {¹H} ^(b) {¹⁹F}

Example 18 Reaction of [P(C₂F₅)₂F₃(dmf)] with H₂O

Water is condensed onto a solution of [P(C₂F₅)₂F₃(dmf)](Ib) in DMF at −196° C. The reaction mixture is warmed to room temperature and investigated by NMR spectroscopy.

³¹P-NMR spectroscopic data of [H(dmf)_(n)][P(C₂F₅)₂F₃OH] in DMF

δ, ppm Multiplicity J[Hz] Assignment −154.4 d, t, quin ¹J(PF_(A)) = 910 [H(dmf)_(n)][P(C₂F₅)₂F₃OH] ¹J(PF_(B)) = 926 ²J(PF) = 108

¹⁹F-NMR spectroscopic data of [H(dmf)_(n)][P(C₂F₅)₂F₃OH] in DMF

δ, ppm Multiplicity J[Hz] Assignment Integral −63.2 d, m ¹J(PF) = 910 PF_(A) 0.6 −76.0 d, d, m ¹J(PF) = 926 PF_(B) 2 ²J(FF) = 46 −83.4 d, t ³J(PF) = 11 CF₃ 6 ³J(FF) = 7 −118.9 d, quar ²J(PF) = 103 CF₂ 4 ³J(FF) = 10

Example 19 Reaction of [P(C₂F₅)₂F₃(dmf)] with EtOH

Ethanol is condensed onto a solution of [P(C₂F₅)₂F₃(dmf)](Ib) in DMF at −196° C. The reaction mixture is warmed to room temperature and investigated by NMR spectroscopy.

³¹P-NMR spectroscopic data of [H(dmf)_(n)][P(C₂F₅)₂F₃OEt] in DMF

δ, ppm Multiplicity J[Hz] Assignment −152.6 d, t, quin ¹J(PF_(A)) = 860 [H(dmf)_(n)][P(C₂F₅)₂F₃OEt] ¹J(PF_(B)) = 876 ²J(PF) = 94

¹⁹F-NMR spectroscopic data of [H(dmf)_(n)][P(C₂F₅)₂F₃OEt] in DMF

δ, ppm Multiplicity J[Hz] Assignment Integral −57.2 d, m ¹J(PF) = 860 PF_(A) 1 −78.5 d, d, m ¹J(PF) = 876 PF_(B) 2.5 ²J(FF) = 47 −83.5 d, t ³J(PF) = 13 CF₃ 8 ³J(FF) = 7 −119.3 d, d, t ²J(PF) = 94 CF₂ 5 ³J(FF_(A)) = 16 ³J(FF_(B)) = 8

Example 20 Reaction of (C₂F₅)₃PF₂— DMAP with 2-[2-(aminoethyl)-amino]ethanol

Experimental Procedure

6.50 g (11.86 mmol) of (C₂F₅)₃PF₂— DMAP in 80 ml of dichloromethane are initially introduced in a 100 ml Schlenk flask under protective gas, and 1.23 g (11.86 mmol) of 2-[2-(aminoethyl)amino]ethanol are added dropwise to the solution at 0° C. After the addition, the ice bath is removed, and the mixture is stirred at RT overnight. ¹⁹F- and ³¹P-NMR reaction checks are recorded next morning.

The reaction solution is then freed from CH₂Cl₂ and all volatile constituents in vacuo, leaving a slightly yellow powder.

Crude yield: 7.71 g (91.7% of theory)

If the reaction is carried out in DMF instead of in CH₂Cl₂, another isomer forms in which the two F atoms on the phosphorus are different.

NMR data: in CD₂Cl₂

Nucleus δ (ppm) Splitting Coupling Assignment ³¹P −148.9 t, sept ¹J_(PF) = 879 —PF₂(C₂F₅)₃ ²J_(PF) = 87 ¹⁹F −94.6 d ¹J_(PF) = 879 —PF₂(CF₂CF₃)₃ −81.2 m —PF₂(CF₂CF₃)₃ (6F) −80.0 m —PF₂(CF₂CF₃)₃ (3F) −113.4 m —PF₂(CF₂CF₃)₃ (4F) −113.7 m —PF₂(CF₂CF₃)₃ (2F) ¹H 8.02 d ³J_(HH) = 7.0 DMAP (2H) 6.67 d ³J_(HH) = 7.0 DMAP (2H) 5.61 s, br 4H 4.19 m 2H 3.13 s DMAP (6H) 2.89 m 6H ¹³C 155.9 s DMAP 144.1 s DMAP 106.8 s DMAP 63.2 m —O—CH₂— 48.9 d ³J_(CP) = 8.7 —O—CH₂—CH₂—N— 48.1 s H₂N—(CH₂)₂—N— 39.2 s DMAP 38.2 s H₂N—(CH₂)₂—N—

Example 21 Reaction of (C₂F₅)₃PF₂·DMAP with ethyl 6-hydroxyhexanoate

Experimental Procedure

3.30 g (6.02 mmol) of (C₂F₅)₃PF₂·DMAP in 40 ml of dichloromethane are initially introduced in a 100 ml Schlenk flask under protective gas, and 0.96 g (6.02 mmol) of ethyl 6-hydroxyhexanoate is added dropwise to the solution at 0° C. After the addition, the ice bath is removed, and the mixture is stirred at RT overnight. ¹⁹F- and ³¹P-NMR reaction checks are recorded next morning.

The reaction solution is freed from CH₂Cl₂ and all volatile constituents in vacuo, leaving an orange oil.

Crude yield: 4.2 g (98.6% of theory

NMR data: in CD₂Cl₂

Nucleus δ (ppm) Splitting Coupling Assignment ³¹P −147.9 t, sept ¹J_(PF) = 870 —PF₂(C₂F₅)₃ ²J_(PF) = 89 ¹⁹F −94.4 d ¹J_(PF) = 870 —PF₂(CF₂CF₃)₃ −80.9 m —PF₂(CF₂CF₃)₃ (6F) 79.8 m —PF₂(CF₂CF₃)₃ (3F) −113.0 m —PF₂(CF₂CF₃)₃ (4F) −113.3 m —PF₂(CF₂CF₃)₃ (2F) ¹H 7.92 d ³J_(HH) = 7.0 DMAP (2H) 6.80 d ³J_(HH) = 7.0 DMAP (2H) 4.13 q —O—CH₂CH₃ (2H) 3.99 q —O—(CH₂)₄—CH₂— (2H) 3.26 s DMAP (6H) 2.32 t ³J_(HH) = 7.4 —O—(CH₂)₄—CH₂— 1.62 m C(O)— (2H) 1.53 m —O—(CH₂)₄—CH₂— (2H) 1.32 m —O—(CH₂)₄—CH₂— (2H) 1.27 t ³J_(HH) = 7.0 —O—(CH₂)₄—CH₂— (2H) —O—CH₂—CH₃ (3H) ¹³C 174.8 s —C(O)— 157.5 s DMAP 138.4 s DMAP 107.1 s DMAP 66.8 m —O—CH₂—(CH₂)₄— 60.5 s —O—CH₂CH₃ 40.0 s DMAP 34.3 s —O—CH₂—CH₂— 30.7 d ³J_(PC) = 8.1 (CH₂)₃— 25.2 s —O—CH₂—CH₂— 24.7 s (CH₂)₃— 13.8 s —O—CH₂—CH₂— (CH₂)₃— —O—CH₂—CH₂— (CH₂)₃— —O—CH₂—CH₃

Example 22 (C₂F₅)₃PF₂·DMAP with Ethanolamine

4.27 g (7.79 mmol) of (C₂F₅)₃PF₂·DMAP in 60 ml of dichloromethane are initially introduced in a 100 ml Schlenk flask under protective gas, and 0.48 g (7.79 mmol) of ethanolamine is added dropwise to the solution at 0° C. After the addition, the ice bath is removed, and the mixture is stirred at RT overnight. ¹⁹F- and ³¹P-NMR reaction checks are recorded next morning. The reaction solution is then freed from CH₂Cl₂ and all volatile constituents in vacuo, leaving a slightly yellow powder.

Crude yield: 4.55 g (95.8% of theory)

NMR data: in CD₂Cl₂

Nucleus δ (ppm) Splitting Coupling Assignment ³¹P −148.4 t, sept ¹J_(PF) = 875 —PF₂(C₂F₅)₃ ²J_(PF) = 87 ¹⁹F −94.7 d ¹J_(PF) = 875 —PF₂(CF₂CF₃)₃ −81.3 m —PF₂(CF₂CF₃)₃ (6F) −80.0 m —PF₂(CF₂CF₃)₃ (3F) −113.3 m —PF₂(CF₂CF₃)₃ (4F) −113.5 m —PF₂(CF₂CF₃)₃ (2F) ¹H 8.00 d ³J_(HH) = 5.2 DMAP (2H) 7.73 s, br —NH₂ (2H) 6.73 d ³J_(HH) = 5.2 DMAP (2H) 4.15 m —O—(CH₂)— 3.19 s NH₂(2H) 2.94 m DMAP (6H) 156.7 s —O—(CH₂)— 141.4 s NH₂(2H) ¹³C 106.9 s DMAP 65.2 m DMAP 41.8 d DMAP 39.6 s ³J_(CP) = 8.7 —O—CH₂—CH₂— NH₂ —O—CH₂—CH₂— NH₂ DMAP Note: If the reaction is carried out in DMF instead of in CH₂Cl₂, another isomer forms in which the two F atoms on the phosphorus are different.

Example 23 Reaction of (C₂F₅)₃PF₂.DMAP with 2-methoxyethanol

3.86 g (7.04 mmol) of (C₂F₅)₃PF₂— DMAP in 60 ml of dichloromethane are initially introduced in a 100 ml Schlenk flask under protective gas, and 0.54 g (7.04 mmol) of 2-methoxyethanol is added dropwise to the solution at 0° C. After the addition, the ice bath is removed, and the mixture is stirred at RT overnight. ¹⁹F- and ³¹P-NMR reaction checks are recorded next morning.

The reaction solution is then freed from CH₂Cl₂ and all volatile constituents in vacuo, leaving a slightly yellow powder.

Crude yield: 4.38 g (99.8% of theory)

NMR data: in CD₂Cl₂

Nucleus δ (ppm) Splitting Coupling Assignment ³¹P −147.8 t, sept ¹J_(PF) = 878 —PF₂(C₂F₅)₃ ²J_(PF) = 89 ¹⁹F −94.8 d ¹J_(PF) = 878 —PF₂(CF₂CF₃)₃ −81.0 m —PF₂(CF₂CF₃)₃ (6F) −79.9 m —PF₂(CF₂CF₃)₃ (3F) −113.2 m —PF₂(CF₂CF₃)₃ (4F) −113.5 m —PF₂(CF₂CF₃)₃ (2F) ¹H 8.03 d ³J_(HH) = 6.3 DMAP (2H) 6.75 d ³J_(HH) = 6.3 DMAP (2H) 4.27 m —O—(CH₂)₂—O— 3.62 m CH₃(2H) 3.32 s —O—(CH₂)₂—O— 3.24 s CH₃(2H) 157.3 s —O—CH₃ 139.3 s DMAP (6H) ¹³C 106.6 s DMAP 73.5 d ³J_(CP) = 7.9 DMAP 65.6 m DMAP 57.6 s —O—CH₂—CH₂— 40.1 s O—CH₃ —O—CH₂—CH₂— O—CH₃ —O—CH₃ DMAP

Example 24 Mg[(C₂F₅)₃PF₂(OH)]₂

4.48 g (10.5 mmol) of tris(pentafluoroethyl)difluorophosphorane are dissolved in 20 ml of Et₂O and cooled to −60° C. A suspension of 0.24 g (6.0 mmol) of magnesium oxide in 18 ml of water is subsequently added in one portion, the mixture is warmed to 0° C., the Et₂O phase is separated off and washed with 20 ml of ice-water. According to ¹⁹F-NMR investigations, the Et₂O solution is composed of: 81% of Mg[(C₂F₅)₃PF₂(OH)]₂, 12% of magnesium tris(pentafluoroethyl)trifluorophosphate (FAP) and 7% of magnesium bis(pentafluoroethyl)phosphinate.

The collected aqueous phase is extracted with 10 ml of Et₂O, and the combined Et₂O solution is evaporated to dryness in vacuo, giving 3.64 g of a pale-pink solid.

Example 25 Na[(C₂F₅)₃PF₂(OH)]

4.26 g (10.0 mmol) of tris(pentafluoroethyl)difluorophosphorane are dissolved in 20 ml of Et₂O and cooled to −60° C., 20.5 ml of an aqueous 0.5 M sodium hydroxide solution are subsequently added dropwise. The mixture is warmed to 0° C., the Et₂O phase is separated off and washed with 20 ml of ice-water. The collected aqueous phase is extracted with 10 ml of Et₂O, and the combined Et₂O solution is evaporated to dryness in vacuo, giving 1.96 g of a white solid.

According to ¹⁹F-NMR spectroscopic investigations of the reaction solution, the Et₂O phase consists virtually exclusively (>95%) of Na[(C₂F₅)₃PF₂(OH)]. After work-up and evaporation of the separated-off ethereal phase to dryness, the solid obtained is, according to ¹⁹F-NMR, composed of 55% of Na[(C₂F₅)₃PF₂(OH)], 30% of sodium tris(pentafluoroethyl)trifluorophosphate (FAP) and 15% of sodium bis(pentafluoroethyl)phosphinate.

NMR data (solvent: CD₃CN; reference substance: ¹H, TMS; ¹⁹F, CCl₃F; ³¹P, 85% H₃PO₄):

Sodium tris(pentafluoroethyl)difluorohydroxyphosphate:

¹H, δ, ppm=4.83 t (1H), ³J_(H,F)=14 Hz;

¹⁹F, δ, ppm=−81.3 s (3F, CF₃); −82.3 s (6F, 2CF₃); −87.5 d, m (2F, PF₂),

¹J_(P,F)=842 Hz; −114.8 d, m (6F, 3CF₂), ²J_(P,F)=86 Hz;

³¹P, δ, ppm=−147.3 t, sept; ¹J_(P,F)=842 Hz, ²J_(P,F)=86 Hz.

Example 26 K[(C₂F₅)₃PF₂(OH)]

4.58 g (10.8 mmol) of tris(pentafluoroethyl)difluorophosphorane are dissolved in 20 ml of Et₂O and cooled to −60° C. 22 ml of an aqueous 0.5 M potassium hydroxide solution are subsequently added dropwise. The mixture is warmed to 0° C., the Et₂O phase is separated off and washed with 20 ml of ice-water. The collected aqueous phase is extracted with 10 ml of Et₂O, and the combined Et₂O solution is evaporated to dryness in vacuo, giving 3.59 g of a white solid. The solid obtained is, according to ¹⁹F-NMR, composed of 87% of K[(C₂F₅)₃PF₂(OH)], 10% of potassium tris(pentafluoroethyl)trifluorophosphate (FAP) and 3% of potassium bis(pentafluoroethyl)-phosphinate.

NMR data (solvent: CD₃CN; reference substance: ¹H, TMS; ¹⁹F, CCl₃F; ³¹P, 85% H₃PO₄):

Potassium tris(pentafluoroethyl)difluorohydroxyphosphate:

¹H, δ, ppm=3.27 br.s (1H);

¹⁹F, δ, ppm=−80.7 m (3F, CF₃); −81.7 m (6F, CF₃); −87.0 d, m (2F, PF₂),

¹J_(P,F)=842 Hz; −114.6 d, m (6F, 3CF₂), ²J_(P,F)=85 Hz;

³¹P, δ, ppm=−147.2 t, sept, ¹J_(P,F)=842 Hz, ²J_(P,F)=85 Hz.

Example 27 Cs[(C₂F₅)₃PF₂(OH)]

4.30 g (10.1 mmol) of tris(pentafluoroethyl)difluorophosphorane are dissolved in 20 ml of Et₂O and cooled to −60° C. 26 ml of an aqueous 0.5 M caesium hydroxide solution are subsequently added dropwise. The mixture is warmed to 0° C., the Et₂O phase is separated off and washed with 20 ml of ice-water. The collected aqueous phase is extracted with 10 ml of Et₂O, and the combined Et₂O solution is evaporated to dryness in vacuo, giving 4.18 g of a white solid. The solid obtained is, according to ¹⁹F-NMR, composed of 94% of Cs[(C₂F₅)₃PF₂(OH)], 5% of caesium tris(pentafluoroethyl)-trifluorophosphate (FAP) and 1% of caesium bis(pentafluoroethyl)phosphinate.

NMR data (solvent: CD₃CN; reference substance: ¹H, TMS; ¹⁹F, CCl₃F; ³¹P, 85% H₃PO₄):

Caesium tris(pentafluoroethyl)difluorohydroxyphosphate:

¹H, δ, ppm=4.83 t (1H), ³J_(H,F)=14 Hz;

¹⁹F, δ, ppm=−80.7 s (3F, CF₃); −81.7 s (6F, 2CF₃); −87.0 d, m (2F, PF₂),

¹J_(P,F)=842 Hz; −114.6 d, m (6F, 3CF₂), ²J_(P,F)=85 Hz;

³¹P, δ, ppm=−147.2 t, sept, ¹J_(P,F)=842 Hz, ²J_(P,F)=85 Hz.

Example 28 [(CH₃)₄N]⁺[(C₂F₅)₃PF₂OH]⁻

3.63 g (8.5 mmol) of tris(pentafluoroethyl)difluorophosphorane are cooled to −50° C., and 3.13 g (8.6 mmol) of an aqueous 25% solution of tetramethyl-ammonium hydroxide are added. The white precipitate was filtered off and dried in vacuo, giving 3.4 g of a white solid. The solid obtained is, according to ¹⁹F-NMR, composed of 74% of hydroxyl complex [(CH₃)₄N]⁺[(C₂F5)₃—PF₂OH]⁻, 4% of tetramethylammonium tris(pentafluoroethyl)trifluorophosphate (FAP) and 22% of tetramethylammonium bis(pentafluoroethyl)phosphinate.

NMR data (solvent: CD₃CN; reference substance: ¹H, TMS; ¹⁹F, CCl₃F; ³¹P, 85% H₃PO₄): Tris(pentafluoroethyl)difluorohydroxyphosphate tetramethylammonium salt, hydroxyl complex:

¹H, δ, ppm=3.07 s, (12H, 4CH₃); 4.92 t,d (1H), ³J_(H,F)=14 Hz, ²J_(P,H)=2 Hz.

¹⁹F, δ, ppm=−80.7 m (3F, CF₃); −81.8 m (6F, 2CF₃); −87.3 d, m (2F, PF₂), ¹J_(P,F)=842 Hz; −114.7 d, m (6F, 3CF₂), ²J_(P,F)=86 Hz.

³¹P, δ, ppm=−147.2 t, sept, ¹J_(P,F)=842 Hz, ²J_(P,F)=86 Hz.

Example 29 [(C₂H₅)₄N]⁺[(C₂F₅)₃PF₂OH]⁻.3H₂O

4.46 g (10.5 mmol) of tris(pentafluoroethyl)difluorophosphorane are dissolved in 20 ml of Et₂O and cooled to −60° C. 17.2 g (10.7 mmol) of an aqueous tetraethylammonium hydroxide solution (about 0.6 M) are subsequently added dropwise. The mixture is warmed to 0° C., and the white solid which precipitates is filtered off and dried in air, giving 5.66 g of a white solid, which, according to ¹⁹F-NMR and ¹H-NMR spectra, consists of 95% of [(C₂H₅)₄N]⁺[(C₂F₅)₃PF₂OH]⁻.3H₂O. Yield is 86%. On drying of the solid overnight in vacuo, this complex eliminates water and C₂F5H and forms [(C₂H₅)₄N]⁺[(C₂F5)₂P F₂O]⁻.

NMR data (solvent: CD₃CN; reference substance: ¹H, ¹³C, TMS; ¹⁹F, CCl₃F; ³¹P, 85% H₃PO₄):

Tris(pentafluoroethyl)difluorohydroxyphosphate tetraethylammonium salt.3H₂O, hydroxyl complex.3H₂O:

¹H, δ, ppm=1.20 t,t (12H, 4CH₃), ³J_(H,H)=7 Hz, ³J_(H,14N)=2 Hz; 2.22 s, (6H, 3H₂O); 3.14 q (8H, 4CH₂), ³J_(H,H)=7 Hz; 4.86 t,d (1H), ³J_(H,F)=14 Hz, ²J_(H,P)=2 Hz.

¹³C{¹H}, δ, ppm=115-128 m, (CF₂CF₃); 53.2 t, (4C, CH₂), ¹J_(14N,13C)=3 Hz; 7.7 s, (4C, CH₃).

¹⁹F, δ, ppm=−80.7 m (3F, CF₃); −81.8 m (6F, 2CF₃); −87.4 d, m (2F, PF₂), ¹J_(P,F)=842 Hz; −114.8 d, m (6F, 3CF₂), ²J_(P,F)=86 Hz.

³¹P, δ, ppm=−147.3 t, sept, ¹J_(P,F)=842 Hz, ²J_(P,F)=86 Hz.

Example 30 [(C₄H₉)₄N]⁺[(C₂F₅)₃PF₂OCH₃]⁻

4.20 g (9.9 mmol) of tris(pentafluoroethyl)difluorophosphorane are cooled to −50° C., and 10 ml (10 mmol) of a 1M solution of tetrabutylammonium hydroxide in methanol are added with vigorous stirring. According to ¹⁹F- and ¹H-NMR spectra, a mixture consisting of two complexes:

[(C₄H₉)₄N]⁺[(C₂F₅)₃PF₂OH]⁻ and [(C₄H₉)₄N]⁺[(C₂F₅)₃PF₂OCH₃]⁻, is formed. Removal of volatile constituents gives 6.0 g of white solid, which, according to ¹⁹F- and ¹H-NMR spectra, consists of 40% of [(C₄H₉)₄]N⁺[(C₂F₅)₂PF₂O]⁻ and 60% of [(C₄H₉)₄]N+[(C₂F₅)₃PF₂OCH₃]⁻.

NMR data (solvent: methanol; lock: CD₃CN; reference substance: ¹H, TMS; ¹⁹F, CCl₃F; ³¹P, 85% H₃PO₄):

Tris(pentafluoroethyl)difluorohydroxyphosphate tetrabutylammonium salt, hydroxyl complex:

¹H, δ, ppm=0.98 t (12H, 4CH₃), ³J_(H,H)=7 Hz; 1.36 m, (8H, 4CH₂); 1.61 m, (8H, 4CH₂); 3.10 m, (8H, 4CH₂); 4.86 t,d (1H), ³J_(H,F)=14 Hz, ²J_(H,P)=2 Hz.

¹⁹F, δ, ppm=−80.7 m (3F, CF₃); −81.8 m (6F, 2CF₃); −87.4 d, m (2F, PF₂), ¹J_(P,F)=842 Hz; −114.8 d, m (6F, 3CF₂), ²J_(P,F)=86 Hz.

³¹P, δ, ppm=−147.3 t, sept, ¹J_(P,F)=842 Hz, ²J_(P,F)=86 Hz.

Tris(pentafluoroethyl)difluoromethoxyphosphate tetrabutylammonium salt, [(C₄H₉)₄N]⁺[(C₂F5)₃P F₂OCH₃]⁻.

¹H, δ, ppm=0.98 t (12H, 4CH₃), ³J_(H,H)=7 Hz; 1.36 m, (8H, 4CH₂); 1.61 m, (8H, 4CH₂); 3.10 m, (8H, 4CH₂); 3.56 d, m (3H, CH₃), ³J_(H,P)=13 Hz.

¹⁹F, δ, ppm=−80.7 m (3F, CF₃); −81.8 m (6F, 2CF₃); −95.9 d, m (2F, PF₂), ¹J_(P,F)=867 Hz; −114.1 d, m (6F, 3CF₂), ²J_(P,F)=84 Hz.

³¹P, δ, ppm=−148.5 t, sept, q, ¹J_(P,F)=867 Hz, ²J_(P,F)=84 Hz, ³J_(P,H)=13 Hz.

Bis(pentafluoroethyl)difluorooxophosphorane tetrabutylammonium salt, [(C₂F₅)₂PF₂O]⁻[(C₄H₉)₄N]⁺:

¹H, δ, ppm=0.98 t (12H, 4CH₃), ³J_(H,H)=7 Hz; 1.36 m, (8H, 4CH₂); 1.61 m, (8H, 4CH₂); 3.10 m, (8H, 4CH₂); 3.56 d, m (3H, CH₃), ³J_(H,P)=13 Hz.

¹⁹F, δ, ppm=−67.5 d, m (2F, PF₂), ¹J_(P,F)=1108 Hz; −81.9 t, (6F, 2CF₃), ⁴J_(F,F)=11 Hz; −124.8 d, t (4F, 2CF₂), ²J_(P,F)=78 Hz; ³J_(F,F)=7 Hz.

³¹P, δ, ppm=−62.5 t, quin, ¹J_(P,F)=1108 Hz, ²J_(P,F)=78 Hz.

Example 31 [(C₄H₉)₄P]⁺[(C₂F₅)₃PF₂OH]⁻

4.66 g (10.9 mmol) of tris(pentafluoroethyl)difluorophosphorane are dissolved in 20 ml of Et₂O and cooled to −60° C. 20 ml (10.9 mmol) of an aqueous tetrabutylphosphonium hydroxide 0.55M solution are subsequently added with vigorous stirring. The mixture is warmed to 0° C., and the white solid which precipitates is filtered off and dried in air, giving 5.68 g of a white solid, which, according to ¹⁹F NMR spectrum, consists of 85% of hydroxyl complex [(C₄H₉)₄P]⁺[(C₂F₅)₃PF₂OH]⁻, 11% of tetrabutylphosphonium tris(pentafluoroethyl)trifluorophosphate (FAP) and 4% of tetrabutylphosphonium bis(pentafluoroethyl)phosphinate.

NMR data (solvent: CD₃CN; reference substance: ¹⁹F, CCl₃F; ³¹P, 85% H₃PO₄):

Tris(pentafluoroethyl)difluorohydroxyphosphate tetrabutylphosphonium salt, hydroxyl complex:

¹⁹F, δ, ppm=−80.7 m (3F, CF₃); −81.7 m (6F, 2CF₃); −87.0 d, m (2F, PF₂), ¹J_(P,F)=842 Hz; −114.6 d, m (6F, 3CF₂), ²J_(P,F)=85 Hz.

³¹P, δ, ppm=−147.2 t, sept, ¹J_(P,F)=842 Hz, ²J_(P,F)=85 Hz.

Example 32 K[(C₂F₅)₃PF₂(OH)]

0.98 g (10 mmol) of potassium acetate are dissolved in 10 ml of water, and 4.34 g (10.2 mmol) of tris(pentafluoroethyl)difluorophosphorane are added slowly at 0° C. with vigorous stirring. After 10 minutes, all volatile components are removed at 0° C. in vacuo, giving 4.9 g of a colourless solid, which, according to ¹⁹F-NMR spectrum, consists of 91% of K[(C₂F₅)₃PF₂(OH)]hydroxyl complex, 6% of potassium tris(pentafluoroethyl)trifluorophosphate (FAP) and 3% of potassium bis(pentafluoroethyl)phosphinate. The substance exhibits a weight loss of 24% at 104° C., which corresponds to liberation of C₂F5H.

Potassium tris(pentafluoroethyl)difluorohydroxyphosphate, hydroxyl complex:

NMR data (solvent: CD₃CN; reference substance: ¹⁹F, CCl₃F; ³¹P, 85% H₃PO₄):

¹⁹F, δ, ppm=−80.7 m (3F, CF₃); −81.7 m (6F, 2CF₃); −87.0 d, m (2F, PF₂), ¹J_(P,F)=842 Hz; −114.6 d (6F, 3CF₂), ²J_(P,F)=85 Hz.

³¹P, δ, ppm=−147.2 t, sept, ¹J_(P,F)=842 Hz, 2J_(P,F)=85 Hz.

Example 33 Reaction with Potassium Acetate, CH₃C(O)OK, in Acetonitrile

a) 0.66 g (6.7 mmol) of potassium acetate are initially introduced in 10 ml of acetonitrile, and 3.14 g (7.4 mmol) of tris(pentafluoroethyl)difluorophosphorane are added at 0° C. with vigorous stirring. The cooling bath is removed, and the reaction mixture is warmed to room temperature. After stirring for 15 minutes and dissolution of the potassium acetate, all volatile components are removed in vacuo, giving 3.37 g (yield: 96%) of a colourless solid, which, according to ¹⁹F-NMR spectrum, consists of a 1:1 mixture of complexes (A) and (B).

NMR data (solvent: CD₃CN; reference substance: ¹H, TMS; ¹⁹F, CCl₃F; ³¹P, 85% H₃PO₄):

Complex A

¹H, δ, ppm=2.02 d (3H, CH₃C(O)), ⁴J_(H,P)=1 Hz.

¹⁹F, δ, ppm=−46.4 d, m (1F, PF₂), ¹J_(P,F)=914 Hz; −79.7 d, m (1F, PF₂) ¹J_(P,F)=862 Hz; −81.0 m (3F, CF₃); −82.6 m (6F, 2CF₃); −113.6 d, d (4F, 2CF₂), ²J_(F(A),F(B))=292 Hz, ²J_(P,F)=104 Hz; −119.3 d, d (2F, CF₂), ²J_(F(A),F(B))=292 Hz, ²J_(P,F)=90 Hz.

³¹P, δ, ppm=−148.1 d, d,t,quin, ¹J_(P,F)=914 Hz, ¹J_(P,F)=862 Hz, ²J_(P,F)=104 Hz; ²J_(P,F)=90 Hz.

Complex B

¹H, δ, ppm=1.94 d (3H, CH₃C(O)), ⁴J_(H,P)=2 Hz.

¹⁹F, δ, ppm=−62.0 d, m (2F, PF₂) ¹J_(P,F)=826 Hz; −82.7 m (6F, 2CF₃); −83.1 m (3F, CF₃); −114.0 d, m (4F, 2CF₂), ²J_(P,F)=78 Hz; −114.8 d, m (2F, CF₂), ²J_(P,F)=78 Hz.

³¹P, δ, ppm=−151.3 t, sept, ¹J_(P,F)=826 Hz, ²J_(P,F)=78 Hz.

b) 0.25 g (2.5 mmol) of potassium acetate are initially introduced in 15 ml of acetonitrile, and 1.10 g (2.6 mmol) of tris(pentafluoroethyl)difluorophosphorane are added at 0° C., and the mixture is stirred vigorously for two hours. All volatile constituents are subsequently removed in vacuo over the course of two hours, giving 1.30 g (yield: 98%) of a colourless solid, which, according to ¹⁹F-NMR spectrum, consists of a 6:1 mixture of complexes (C) and (B).

NMR data (solvent: CD₃CN; reference substance: ¹H, TMS; ¹⁹F, CCl₃F; ³¹P, 85% H₃PO₄):

Complex C

¹H, δ, ppm=1.97 s (CH₃).

¹⁹F, δ, ppm=−81.4 m (3F, CF₃); −82.5 m (6F, 2CF₃); −88.9 d, m (2F, PF₂) ¹J_(P,F)=912 Hz; −115.7 d, m (4F, 2CF₂), ²J_(P,F)=85 Hz; −116.6 d, m (2F, CF₂), ²J_(P,F)=103 Hz;

³¹P, δ, ppm=−144.1 t,quin,t, ¹J_(P,F)=912 Hz, ²J_(P,F)=103 Hz; ²J_(P,F)=85 Hz.

Complex B

¹H, δ, ppm=1.94 d (3H, CH₃C(O)), ⁴J_(H,P)=2 Hz;

¹⁹F, δ, ppm=−62.0 d, m (2F, PF₂) ¹J_(P,F)=826 Hz; −82.7 m (6F, 2CF₃); −83.1 m (3F, CF₃); −114.0 d, m (4F, 2CF₂), ²J_(P,F)=78 Hz; −114.8 d, m (2F, CF₂), 2J_(P,F)=78 Hz;

³¹P, δ, ppm=−151.3 t, sept, ¹J_(P,F)=826 Hz, ²J_(P,F)=78 Hz.

c) 0.44 g (4.5 mmol) of potassium acetate are initially introduced in 10 ml of acetonitrile, and 1.90 g (4.5 mmol) of tris(pentafluoroethyl)difluorophosphorane are added at 0° C., and the mixture is stirred vigorously for one hours. All volatile constituents are subsequently removed overnight in vacuo, giving 2.30 g (yield: 98%) of a colourless solid, which, according to ¹⁹F-NMR spectrum, consists of a 3:16:1 mixture of complexes (A), (B) and (C).

Example 34

Reaction with tetrabutylammonium acetate, [(C₄H₉)₄N]⁺[CH₃C(O)O]⁻ in acetonitrile

2.11 g (7 mmol) of tetrabutylammonium acetate (dried in an oil-pump vacuum at 100° C. for one hour) are dissolved in 20 ml of acetonitrile, and 3.11 g (7.3 mmol) of tris(pentafluoroethyl)difluorophosphorane are added at room temperature, and the mixture is stirred vigorously for 15 minutes. All volatile constituents are subsequently removed in vacuo, giving 4.98 g (yield: 98%) of a viscous liquid, which, according to ¹⁹F NMR spectrum, consists of a 10:7 mixture of complexes (A) and (B).

NMR data (solvent: CD₃CN; reference substance: ¹H, TMS; ¹⁹F, CCl₃F; ³¹P, 85% H₃PO₄):

Complex A

¹H, δ, ppm=0.98 t (12H, 4CH₃), ³J_(H,H)=7 Hz; 1.36 m, (8H, 4CH₂); 1.61 m, (8H, 4CH₂); 2.02 d (3H, CH₃C(O)), ⁴J_(H,P)=1 Hz; 3.10 m, (8H, 4CH₂).

¹⁹F, δ, ppm=−46.4 d, m (1F, PF₂), ¹J_(P,F)=914 Hz; −79.7 d, m (1F, PF₂) ¹J_(P,F)=862 Hz; −81.0 m (3F, CF₃); −82.6 m (6F, 2CF₃); −113.6 d, d (4F, 2CF₂), ²J_(F(A),F(B))=292 Hz, ²J_(P,F)=104 Hz; −119.3 d, d (2F, CF₂), ²J_(F(A),F(B))=292 Hz, 2J_(P,F)=90 Hz.

³¹P, δ, ppm=−148.1 d, d,t,quin, ¹J_(P,F)=914 Hz, ¹J_(P,F)=862 Hz, ²J_(P,F)=104 Hz; ²J_(P,F)=90 Hz.

Complex B

¹H, δ, ppm=0.98 t (12H, 4CH₃), ³J_(H,H)=7 Hz; 1.36 m, (8H, 4CH₂); 1.61 m, (8H, 4CH₂); 1.94 d (3H, CH₃C(O)), ⁴J_(H,P)=2 Hz; 3.10 m, (8H, 4CH₂).

¹⁹F, δ, ppm=−62.0 d, m (2F, PF₂) ¹J_(P,F)=826 Hz; −82.7 m (6F, 2CF₃); −83.1 m (3F, CF₃); −114.0 d, m (4F, 2CF₂), ²J_(P,F)=78 Hz; −114.8 d, m (2F, CF₂), 2J_(P,F)=78 Hz;

³¹P, δ, ppm=−151.3 t, sept, J_(P,F)=826 Hz, ²J_(P,F)=78 Hz.

Example 35

Reaction with potassium oxalate, K₂C₂O₄, in acetonitrile

0.34 g (1.8 mmol) of potassium oxalate monohydrate (dried in an oil-pump vacuum at 140° C. for two hours) are suspended in 20 ml of acetonitrile, and 1.64 g (3.8 mmol) of tris(pentafluoroethyl)difluorophosphorane are added at room temperature. The reaction mixture is stirred vigorously for 1.5 hour in order to dissolve the oxalate. All volatile constituents are subsequently removed in vacuo, giving 1.88 g (yield: 100%, based on potassium oxalate employed) of a colourless solid.

NMR data (solvent: CD₃CN; reference substance: ¹⁹F, CCl₃F; ³¹P, 85% H₃PO₄):

¹⁹F, δ, ppm=−60.3 d, m (2F, PF₂), ¹J_(P,F)=836 Hz; −82.4 m (6F, 2CF₃); −83.1 m (3F, CF₃); −114-−116 m (6F, CF₂).

³¹P, δ, ppm=−148.8 t, sept, ¹J_(P,F)=836 Hz; ²J_(P,F)=80 Hz.

IR Spectrum:

{tilde over (v)} (CO)=1742. 

1. Compounds of the formula I Kt^(z+) z[P(R_(f))_(n)F_(5-n)X]⁻  I, where R_(f) in each case, independently of one another, denotes a straight-chain or branched fluoroalkyl group having 1 to 8 C atoms, X denotes OR, Ac, OAr or OHet, Ac denotes a carboxyl group OC(O)R, also including carboxyl groups of an aliphatic dicarboxylic acid resulting in compounds having the formula Ib x[Kt]^(z+) y[(R_(f))_(n)PF_(5-n)(OC(O)—R′—C(O)O)F_(5-n)P(R_(f))_(n)]²⁻  Ib, where x denotes 2 and y denotes 1 if z denotes 1, x denotes 1 and y denotes 1 if z denotes 2, x denotes 2 and y denotes 3 if z denotes 3 and x denotes 1 and y denotes 2 if z denotes 4 and R′ denotes a single bond or an alkylene group having 1 to 4 C atoms, Ar denotes an aryl group having 6 to 12 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, Alk denotes a straight-chain or branched alkyl group having 1 to 12 C atoms, Het denotes a heteroaryl group having 5 to 13 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, R denotes H, a straight-chain or branched alkyl group having 1 to 20 C atoms, which may be partially substituted by Hal, NH₂, NHAlk, NAlk₂, OH, NO₂, CN or SO₃H, or denotes a straight-chain or branched alkenyl group having 2 to 20 C atoms, which may contain a plurality of double bonds, where one or two non-adjacent carbon atoms of the alkyl or alkenyl group which are not bonded to the heteroatom may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, NH, —C(O)—, —O—C(O)— or —C(O)—O— and Kt denotes a stabilised proton, a metal cation or an organic cation, Hal denotes F, Cl, Br or I, z denotes 1, 2, 3 or 4 and n denotes 1, 2 or 3, and/or tautomers or stereoisomers thereof, including mixtures thereof in all ratios.
 2. Compounds of claim 1, where Kt is a stabilised proton which is stabilised by an organic base or a basic solvent.
 3. Compounds of claim 1, where Kt is a proton which is stabilised by an organic base, which is stabilised by an aromatic amine, a dialkylformamide or dialkylacetamide whose alkyl groups each have, independently of one another, 1 to 8 C atoms, as organic base.
 4. Compounds of claim 1, where Kt is a proton which is stabilised by a basic solvent, where the basic solvent is selected from the group water, dialkyl ethers containing straight-chain or branched alkyl groups, which each have, independently of one another, 1 to 4 C atoms, aliphatic alcohols having 1 to 8 C atoms, ethyl acetate, acetonitrile, dimethyl sulfoxide or N-alkyl-2-pyrrolidone containing a straight-chain or branched alkyl group which has 1 to 8 C atoms.
 5. Compounds of claim 1, where Kt is an organic cation selected from the organic cations of the formulae (1) to (8), ammonium cations of the formula (1), sulfonium cations of the formula (2) or oxonium cations of the formula (3) [N(R⁰)₄]⁺  (1) [S(R⁰)₃]⁺  (2) or [O(R⁰)₃]⁺  (3) where R⁰ in each case, independently of one another, denotes H, where all substituents R⁰ in formula (2) cannot simultaneously be H straight-chain or branched alkyl having 1-20 C atoms, straight-chain or branched alkenyl having 2-20 C atoms and one or more double bonds, straight-chain or branched alkynyl having 2-20 C atoms and one or more triple bonds, saturated or partially unsaturated cycloalkyl having 3-7 C atoms, which may be substituted by straight-chain or branched alkyl groups having 1-6 C atoms, aryl having 6 to 12 C atoms, which may be substituted by straight-chain or branched alkyl groups having 1-6 C atoms, where R⁰ may be partially substituted by halogen or partially substituted by —OR¹, —C(O)OR¹, —OC(O)R¹, —OC(O)OR¹, —C(O)NR¹ ₂ or —SO₂NR¹ ₂, and where one or two non-adjacent carbon atoms of the radical R⁰ which are not in the α-position may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, —N⁺(R¹)₂—, —C(O)NR¹—, —SO₂NR¹— or —P(O)R—; or phosphonium cations of the formula (4) [P(R²)₄]⁺  (4), where R² in each case, independently of one another, denotes —N(R¹*)₂, straight-chain or branched alkyl having 1-20 C atoms, straight-chain or branched alkenyl having 2-20 C atoms and one or more double bonds, straight-chain or branched alkynyl having 2-20 C atoms and one or more triple bonds, saturated or partially unsaturated cycloalkyl having 3-7 C atoms, which may be substituted by straight-chain or branched alkyl groups having 1-6 C atoms, aryl having 6 to 12 C atoms, which may be substituted by straight-chain or branched alkyl groups having 1-6 C atoms, where R² may be partially substituted by halogen or partially substituted by —OR¹, —C(O)OR¹, —OC(O)R¹, —OC(O)OR¹, —C(O)NR¹ ₂ or —SO₂NR¹ ₂, and where one or two non-adjacent carbon atoms of the R² which are not in the α-position may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)— or —SO₂—; or uronium cations of the formula (5) or thiouronium cations of the formula (6) [C(NR³R⁴)(OR⁵)(NR⁶R⁷)]⁺  (5) or [C(NR³R⁴)(SR⁵)(NR⁶R⁷)]⁺  (6), where R³ to R⁷ each, independently of one another, denote H or N(R¹*)₂, straight-chain or branched alkyl having 1 to 20 C atoms, straight-chain or branched alkenyl having 2-20 C atoms and one or more double bonds, straight-chain or branched alkynyl having 2-20 C atoms and one or more triple bonds, saturated or partially unsaturated cycloalkyl having 3-7 C atoms, which may be substituted by straight-chain or branched alkyl groups having 1-6 C atoms, aryl having 6 to 12 C atoms, which may be substituted by straight-chain or branched alkyl groups having 1-6 C atoms, where one or more of the substituents R³ to R⁷ may be partially substituted by halogens or partially substituted by —OH, —OR¹, —CN, —C(O)NR¹ ₂, —SO₂NR¹ ₂, and where one or two non-adjacent carbon atoms of R³ to R⁷ which are not in the α-position may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, —N⁺(R¹)₂—, —C(O)NR¹—, —SO₂NR¹—, or —P(O)R¹—; or guanidinium cations of the formula (7) [C(NR⁸R⁹)(NR¹⁰R¹¹)(NR¹²R¹³)]⁺  (7), where R⁸ to R¹³ each, independently of one another, denote H or N(R¹*)₂, straight-chain or branched alkyl having 1 to 20 C atoms, straight-chain or branched alkenyl having 2-20 C atoms and one or more double bonds, straight-chain or branched alkynyl having 2-20 C atoms and one or more triple bonds, saturated or partially unsaturated cycloalkyl having 3-7 C atoms, which may be substituted by straight-chain or branched alkyl groups having 1-6 C atoms, aryl having 6 to 12 C atoms, which may be substituted by straight-chain or branched alkyl groups having 1-6 C atoms, where one or more of the substituents R⁸ to R¹³ may be partially substituted by halogens or by —OR¹, —CN, —C(O)NR¹ ₂, —SO₂NR¹ ₂, and where one or two non-adjacent carbon atoms of R⁸ to R¹³ which are not in the α-position may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, —N⁺(R¹)₂—, —C(O)NR¹—, —SO₂NR¹—, or —P(O)R¹—; or heterocyclic cations of the formula (8) [HetN]⁺  (8), where [HetN]⁺ is a heterocyclic cation selected from the group comprising

where the substituents R^(1′) to R^(4′) each, independently of one another, denote H, straight-chain or branched alkyl having 1-20 C atoms, which may also be fluorinated or perfluorinated, straight-chain or branched alkenyl having 2-20 C atoms and one or more double bonds, which may also be fluorinated or perfluorinated, straight-chain or branched alkynyl having 2-20 C atoms and one or more triple bonds, which may also be fluorinated, saturated or partially unsaturated cycloalkyl having 3-7 C atoms, which may be substituted by straight-chain or branched alkyl groups having 1-6 C atoms, aryl having 6 to 12 C atoms, which may be substituted by straight-chain or branched alkyl groups having 1-6 C atoms, saturated, partially or fully unsaturated heteroaryl, heteroaryl-C₁-C₆-alkyl or aryl-C₁-C₆-alkyl, where the substituents R^(1′), R^(2′), R^(3′) and/or R^(4′) together may form a ring system, where one, two or three substituents R^(1′) to R^(4′) may be partially or fully substituted by halogens or partially by —OR¹, —CN, —C(O)NR¹ ₂, —SO₂NR¹ ₂, where the substituents R^(1′) and R^(4′) cannot be substituted simultaneously and fully by halogens, and where one or two non-adjacent carbon atoms of the substituents R^(1′) to R^(4′) which are not bonded to the heteroatom may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, —N⁺(R¹)₂—, —C(O)NR¹—, —SO₂NR¹—, or —P(O)R¹—; in which R¹ stands for H, non- or partially fluorinated straight-chain or branched C₁- to C₆-alkyl, C₃- to C₇-cycloalkyl, unsubstituted or substituted phenyl and R¹* stands for non- or partially fluorinated straight-chain or branched C₁- to C₆-alkyl, C₃- to C₇-cycloalkyl, unsubstituted or substituted phenyl.
 6. Compounds of claim 1, where Kt is a metal cation selected from cations of the alkali metals, alkaline-earth metals, silver, copper, yttrium, ytterbium, lanthanum, scandium, cerium, neodymium, terbium, samarium, lanthanides, rhodium, rhutenium, iridium, palladium, platinum, osmium, cobalt, nickel, iron, chromium, molybdenum, tungsten, vanadium, titanium, zirconium, hafnium, thorium, uranium or gold, where the corresponding metal cations in solvated form or stabilised by ligands are also included.
 7. Process for the preparation of compounds of the formula I according to claim 1, where Kt denotes a proton which is stabilised by an organic base, characterised in that a fluoroalkylfluorophosphorane of the formula II (R_(f))_(n)PF_(5-n)  II, where R_(f) in each case, independently of one another, denotes a straight-chain or branched fluoroalkyl group having 1 to 8 C atoms and n denotes 1, 2 or 3, is reacted with an organic base, where a compound of the formula IIIa, IIIb or IIIc arises

where R_(f) in each case, independently of one another, has a meaning indicated above and the compound of the formula IIIa, IIIb or IIIc or a tautomeric or stereoisomeric form thereof is subsequently reacted with HX, where X denotes OR, Ac, OAr or OHet, Ac denotes a carboxyl group OC(O)R, Alk denotes a straight-chain or branched alkyl group having 1 to 12 C atoms, Ar denotes an aryl group having 6 to 12 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, Het denotes a heteroaryl group having 5 to 13 C atoms, which may be unsubstituted or substituted by Hal, NH₂, NAlk₂, NHAlk, NO₂, CN, SO₃H or OR, R denotes H or an alkyl group having 1 to 20 C atoms, which may be partially substituted by Hal, NH₂, NHAlk, NAlk₂, NO₂, CN or SO₃H, or denotes an alkenyl group having 2 to 20 C atoms, which may contain a plurality of double bonds, where one or two non-adjacent carbon atoms of the alkyl or alkenyl group which are not bonded to the heteroatom may be replaced by atoms and/or atom groups selected from the group —O—, —S—, —S(O)—, —SO₂—, NH, —C(O)—, —O—C(O)— or —C(O)—O—.
 8. Process for the preparation of compounds of the formula I according to claim 1, where Kt denotes a metal cation or an organic cation, by a salt-exchange reaction, characterised in that a compound of the formula I, where Kt denotes a proton which is stabilised by a base, is reacted with a compound of the formula IV KtA  IV, where Kt denotes a metal cation or an organic cation, according to claim 1 or claims 3, 4 or 5 and A denotes an anion selected from Cl⁻, Br⁻, I⁻, OH⁻, [R₁COO]⁻, [R₁SO₃]⁻, [R₂COO]⁻, [R₂SO₃]⁻, [R₁OSO₃]⁻, [BF₄]⁻, [SO₄]²⁻, [HSO₄]¹⁻, [NO₃]⁻, [(R₂)₂P(O)O]⁻, [R₂P(O)O₂]²⁻ or [CO₃]²⁻, where R₁ in each case, independently of one another, denotes straight-chain or branched alkyl having 1 to 4 C atoms and R₂ in each case, independently of one another, denotes straight-chain or branched perfluorinated alkyl having 1 to 4 C atoms, where the electroneutrality of the salts of the formula KtA must be observed.
 9. A method which comprises performing a polymerization reaction or an isomerisation reaction which comprises employing a compound of claim 2 as an acid catalyst for said polymerization reaction or said isomerisation reaction.
 10. A method of formulating a composition which comprises adding a compound of the formula I according to claim 5 as a solvent or solvent additive, as a catalyst or phase-transfer catalyst, as conductive salt or as an electrolyte constituent, as a fluorosurfactant, as a heat-exchange medium, as a separating agent or extractant, as an antistatic, as a plasticiser, as a lubricant or constituent of lubricating oils or greases, as a hydraulic fluid or additive for hydraulic fluids, as a flameproofing agent or as an additive in fire-extinguishing agents.
 11. A method of formulating an electrolyte which comprises adding a compound of the formula I according to claim 6 as catalyst or as additive in said electrolytes.
 12. Electrolyte comprising at least one compound of the formula I according to claim
 1. 13. Electrolyte according to claim 11, characterised in that the compound of the formula I is present in a molar concentration of 0.1 to 3.5 M.
 14. Electrochemical or opto-electronic cell containing at least one compound of the formula I according to claim
 1. 15. Electrochemical or opto-electronic cell according to claim 14, characterised in that it is a photovoltaic cell, a light-emitting cell, an electrochromic or photoelectrochromic cell, an electrochemical sensor, a biosensor, a primary or secondary battery, a capacitor or a supercapacitor. 